{"id":15162,"date":"2020-03-14T20:04:57","date_gmt":"2020-03-14T13:04:57","guid":{"rendered":"https:\/\/kiencang.net\/?p=15162"},"modified":"2020-03-14T20:04:57","modified_gmt":"2020-03-14T13:04:57","slug":"tang-toc-mua-hang-ebay","status":"publish","type":"post","link":"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/","title":{"rendered":"T\u0103ng t\u1ed1c mua h\u00e0ng tr\u00ean eBay.com"},"content":{"rendered":"\n<p>V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi d\u1ecbch: T\u1ed1i \u01b0u h\u00f3a trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed kh\u00f3 kh\u0103n h\u01a1n c\u00e1c trang b\u00e1o \u0111i\u1ec7n t\u1eed th\u00f4ng th\u01b0\u1eddng. Nguy\u00ean nh\u00e2n \u1edf ch\u1ed7 trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u t\u00ednh n\u0103ng \u0111a d\u1ea1ng, \u0111\u00f2i h\u1ecfi c\u00e1 nh\u00e2n h\u00f3a, b\u1ea3o m\u1eadt, c\u0169ng nh\u01b0 y\u00eau c\u1ea7u t\u00ednh \u0111\u1ed9ng cao h\u01a1n so v\u1edbi trang b\u00e1o \u0111i\u1ec7n t\u1eed v\u1ed1n c\u00f3 th\u1ec3 <a href=\"https:\/\/kiencang.net\/gioi-thieu-plugin-wp2static\/\">cache t\u0129nh ph\u1ea7n l\u1edbn n\u1ed9i dung<\/a>. M\u1ed9t nguy\u00ean nh\u00e2n kh\u00e1c khi\u1ebfn ng\u01b0\u1eddi ta ph\u1ea3i c\u1ea9n tr\u1ecdng h\u01a1n: sai l\u1ea7m khi ti\u1ebfn h\u00e0nh t\u1ed1i \u01b0u h\u00f3a tr\u00ean trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 ph\u1ea3i tr\u1ea3 c\u00e1i gi\u00e1 r\u1ea5t l\u1edbn, nh\u01b0ng \u0111i\u1ec1u ng\u01b0\u1ee3c l\u1ea1i c\u0169ng \u0111\u00fang, l\u1ee3i \u00edch t\u1eeb vi\u1ec7c l\u00e0m chu\u1ea9n c\u0169ng kh\u00f4ng h\u1ec1 nh\u1ecf! Trong khi t\u1ea5t c\u1ea3 nh\u1eefng ng\u01b0\u1eddi \u0111\u1ecdc b\u00e0i vi\u1ebft n\u00e0y c\u00f3 l\u1ebd \u0111\u1ec1u kh\u00f4ng s\u1edf h\u1eefu gian h\u00e0ng ho\u1eb7c kh\u1ed1i t\u00e0i s\u1ea3n b\u1eb1ng 1\/1000 eBay, nh\u01b0ng kho\u1ea3ng c\u00e1ch \u0111\u00f3 kh\u00f4ng ng\u0103n c\u1ea5m ch\u00fang ta mu\u1ed1n c\u00f3 \u0111\u01b0\u1ee3c c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 c\u00e1c bi\u1ec7n ph\u00e1p c\u1ea3i ti\u1ebfn t\u1ed1c \u0111\u1ed9 m\u00e0 \u0111\u1ea1i gia tr\u1ef1c tuy\u1ebfn n\u00e0y th\u1ef1c hi\u1ec7n, c\u0169ng nh\u01b0 nh\u1eadn \u0111\u01b0\u1ee3c \u00edt nhi\u1ec1u l\u1ee3i \u00edch t\u1eeb hi\u1ec3u bi\u1ebft \u0111\u00f3. eBay th\u1ef1c hi\u1ec7n c\u00e1c c\u1ea3i ti\u1ebfn v\u1eeba s\u00e2u v\u1eeba r\u1ed9ng, \u0111\u00e1nh h\u1ea7u kh\u1eafp c\u00e1c m\u1eb7t tr\u1eadn, c\u1ea3 c\u1ee7a \u1ee9ng d\u1ee5ng web, l\u1eabn \u1ee9ng d\u1ee5ng tr\u00ean \u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng n\u1ec1n iOS v\u00e0 Android. Tri\u1ebft l\u00fd cho c\u00e1c bi\u1ec7n ph\u00e1p n\u00e0y \u0111\u1ec1u d\u1ec5 hi\u1ec3u, nh\u01b0ng ch\u00fang ta c\u0169ng bi\u1ebft r\u1eb1ng, tri\u1ec3n khai n\u00f3 tr\u00ean th\u1ef1c t\u1ebf, v\u00e0 \u0111i v\u00e0o chi ti\u1ebft m\u1edbi l\u00e0 \u0111i\u1ec1u kh\u00f3 kh\u0103n, t\u1ed1n nhi\u1ec1u c\u00f4ng s\u1ee9c&#8230; OK, \u0111\u00e3 \u0111\u1ebfn l\u00fac b\u1eaft \u0111\u1ea7u.<\/p>\n\n\n<p>&#8212;<\/p>\n\n\n<p>T\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9 \u1ee9ng d\u1ee5ng v\u00e0 website c\u1ee7a eBay v\u1edbi m\u1ee5c ti\u00eau \u0111em \u0111\u1ebfn tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng nhanh h\u01a1n.<\/p>\n\n\n<p>T\u1ed1c \u0111\u1ed9 l\u00e0 s\u00e1ng ki\u1ebfn to\u00e0n c\u00f4ng ty c\u1ee7a eBay trong n\u0103m 2019, v\u1edbi nhi\u1ec1u nh\u00f3m quy\u1ebft t\u00e2m l\u00e0m cho website v\u00e0 \u1ee9ng d\u1ee5ng nhanh nh\u1ea5t c\u00f3 th\u1ec3 cho ng\u01b0\u1eddi d\u00f9ng. Trong th\u1ef1c t\u1ebf, <strong>v\u1edbi m\u1ed7i 100 mili gi\u00e2y t\u1ea3i c\u1ea3i thi\u1ec7n \u0111\u01b0\u1ee3c trong t\u1ed1c \u0111\u1ed9 t\u1ea3i <a href=\"https:\/\/kiencang.net\/cong-cu-tim-kiem-algolia-wordpress\/\">trang t\u00ecm ki\u1ebfm<\/a>, eBay nh\u1eadn th\u1ea5y gia t\u0103ng 0,5%<\/strong> <strong>s\u1ed1 l\u01b0\u1ee3ng thao t\u00e1c &#8220;Add to Cart \/ Th\u00eam v\u00e0o Gi\u1ecf h\u00e0ng&#8221;.<\/strong> N\u00f3i nhanh cho vu\u00f4ng: t\u0103ng t\u1ed1c gi\u00fap h\u1ecd ki\u1ebfm \u0111\u01b0\u1ee3c nhi\u1ec1u ti\u1ec1n h\u01a1n.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/them-gio-hang.png\" alt=\"t\u0103ng t\u1ed1c website, \u1ee9ng d\u1ee5ng gi\u00fap eBay t\u0103ng s\u1ed1 l\u01b0\u1ee3ng \u0111\u01a1n h\u00e0ng\" class=\"wp-image-15191\"\/><\/figure><\/div>\n\n\n<p>Th\u00f4ng qua vi\u1ec7c \u00e1p d\u1ee5ng \u0111\u1ea7u t\u01b0 v\u00e0o hi\u1ec7u su\u1ea5t (xu\u1ea5t ph\u00e1t sau m\u1ed9t nghi\u00ean c\u1ee9u c\u1ea1nh tranh v\u1edbi Chrome User Experience Report) v\u00e0 nh\u1ea5n m\u1ea1nh v\u00e0o <a href=\"https:\/\/kiencang.net\/chi-so-hieu-suat-nguoi-dung\/\">c\u00e1c ch\u1ec9 s\u1ed1 hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9 t\u1eadp trung v\u00e0o ng\u01b0\u1eddi d\u00f9ng<\/a>, eBay \u0111\u00e3 t\u1ea1o ra \u0111\u01b0\u1ee3c c\u00e1c <a href=\"https:\/\/kiencang.net\/tang-toc-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u1ea3i ti\u1ebfn \u0111\u00e1ng k\u1ec3 v\u1ec1 m\u1eb7t t\u1ed1c \u0111\u1ed9 website<\/a>.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/toc-do-cai-thien-1024x238.png\" alt=\"t\u1ed1c \u0111\u1ed9 c\u1ea3i thi\u1ec7n c\u1ee7a eBay\" class=\"wp-image-15179\"\/><figcaption>T\u1ed1c \u0111\u1ed9 c\u1ea3i thi\u1ec7n c\u1ee7a eBay tr\u00ean c\u00e1c trang kh\u00e1c nhau &amp; tr\u00ean c\u00e1c n\u1ec1n t\u1ea3ng kh\u00e1c nhau<\/figcaption><\/figure><\/div>\n\n\n<p>&#8230;v\u00e0 d\u1eef li\u1ec7u Chrome User Experience Report c\u1ee7a h\u1ecd c\u0169ng l\u00e0m n\u1ed5i b\u1eadt nh\u1eefng c\u1ea3i thi\u1ec7n n\u00e0y.<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/dev-content1-1024x304.png\" alt=\"\" class=\"wp-image-15181\"\/><figcaption>D\u1eef li\u1ec7u Chrome User Experience Report cho <a href=\"https:\/\/kiencang.net\/first-contentful-paint-la-gi\/\">First Contentful Paint<\/a> v\u00e0 <a href=\"https:\/\/kiencang.net\/first-input-delay\/\">First Input Delay<\/a> c\u1ee7a m\u00e1y ch\u1ee7 g\u1ed1c eBay.com<\/figcaption><\/figure>\n\n\n<p>V\u1eabn c\u00f2n nhi\u1ec1u vi\u1ec7c ph\u1ea3i l\u00e0m n\u1eefa, nh\u01b0ng \u0111\u00e2y l\u00e0 c\u00e1c b\u00e0i h\u1ecdc \u0111\u00e1ng gi\u00e1 m\u00e0 eBay r\u00fat ra \u0111\u01b0\u1ee3c.<\/p>\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d6d06daa1\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d6d06daa1\"  type=\"checkbox\" id=\"item-6577d6d06daa1\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Cat_giam_de_tang_hieu_suat_toc_do_web\" title=\"C\u1eaft gi\u1ea3m \u0111\u1ec3 t\u0103ng hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9 web\">C\u1eaft gi\u1ea3m \u0111\u1ec3 t\u0103ng hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9 web<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Giam_tai_tren_tat_ca_cac_tai_nguyen_van_ban\" title=\"Gi\u1ea3m t\u1ea3i tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c t\u00e0i nguy\u00ean v\u0103n b\u1ea3n\">Gi\u1ea3m t\u1ea3i tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c t\u00e0i nguy\u00ean v\u0103n b\u1ea3n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Duong_dan_quan_trong_de_toi_uu_hoa_cho_noi_dung_thuoc_man_hinh_dau_tien\" title=\"\u0110\u01b0\u1eddng d\u1eabn quan tr\u1ecdng \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a cho n\u1ed9i dung thu\u1ed9c m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean\">\u0110\u01b0\u1eddng d\u1eabn quan tr\u1ecdng \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a cho n\u1ed9i dung thu\u1ed9c m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Toi_uu_hoa_hinh_anh\" title=\"T\u1ed1i \u01b0u h\u00f3a h\u00ecnh \u1ea3nh\">T\u1ed1i \u01b0u h\u00f3a h\u00ecnh \u1ea3nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Du_doan_tim_nap_truoc_prefetch_cac_tai_nguyen_tinh\" title=\"D\u1ef1 \u0111o\u00e1n t\u00ecm n\u1ea1p tr\u01b0\u1edbc (prefetch) c\u00e1c t\u00e0i nguy\u00ean t\u0129nh\">D\u1ef1 \u0111o\u00e1n t\u00ecm n\u1ea1p tr\u01b0\u1edbc (prefetch) c\u00e1c t\u00e0i nguy\u00ean t\u0129nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Prefetch_cac_ket_qua_tim_kiem_dau_tien\" title=\"Prefetch c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm \u0111\u1ea7u ti\u00ean\">Prefetch c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm \u0111\u1ea7u ti\u00ean<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Thuc_day_tai_trong_tim_kiem_hinh_anh\" title=\"Th\u00fac \u0111\u1ea9y t\u1ea3i trong t\u00ecm ki\u1ebfm h\u00ecnh \u1ea3nh\">Th\u00fac \u0111\u1ea9y t\u1ea3i trong t\u00ecm ki\u1ebfm h\u00ecnh \u1ea3nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Thuc_day_caching_cho_du_lieu_goi_y_tu_dong_autosuggestion\" title=\"Th\u00fac \u0111\u1ea9y caching cho d\u1eef li\u1ec7u g\u1ee3i \u00fd t\u1ef1 \u0111\u1ed9ng (autosuggestion)\">Th\u00fac \u0111\u1ea9y caching cho d\u1eef li\u1ec7u g\u1ee3i \u00fd t\u1ef1 \u0111\u1ed9ng (autosuggestion)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Thuc_day_cache_cho_trang_chu_cua_nguoi_dung_chua_duoc_nhan_dien_nhung_ai_chua_dang_nhap\" title=\"Th\u00fac \u0111\u1ea9y cache cho trang ch\u1ee7 c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ch\u01b0a \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n (nh\u1eefng ai ch\u01b0a \u0111\u0103ng nh\u1eadp)\">Th\u00fac \u0111\u1ea9y cache cho trang ch\u1ee7 c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ch\u01b0a \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n (nh\u1eefng ai ch\u01b0a \u0111\u0103ng nh\u1eadp)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Toi_uu_hoa_cho_cac_nen_tang_khac\" title=\"T\u1ed1i \u01b0u h\u00f3a cho c\u00e1c n\u1ec1n t\u1ea3ng kh\u00e1c\">T\u1ed1i \u01b0u h\u00f3a cho c\u00e1c n\u1ec1n t\u1ea3ng kh\u00e1c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/#Ket_luan\" title=\"K\u1ebft lu\u1eadn\">K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cat_giam_de_tang_hieu_suat_toc_do_web\"><\/span>C\u1eaft gi\u1ea3m \u0111\u1ec3 t\u0103ng hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9 web<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>C\u00e1c c\u1ea3i thi\u1ec7n c\u1ee7a eBay c\u00f3 \u0111\u01b0\u1ee3c l\u00e0 nh\u1edd gi\u1ea3m ho\u1eb7c &#8220;c\u1eaft&#8221; (v\u1ec1 kh\u00eda c\u1ea1nh k\u00edch c\u1ee1 v\u00e0 th\u1eddi gian) c\u1ee7a nhi\u1ec1u th\u00e0nh ph\u1ea7n tham gia v\u00e0o h\u00e0nh tr\u00ecnh c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. B\u00e0i vi\u1ebft n\u00e0y bao tr\u00f9m c\u00e1c ch\u1ee7 \u0111\u1ec3 m\u00e0 c\u00f3 li\u00ean quan \u0111\u1ebfn c\u1ed9ng \u0111\u1ed3ng l\u1eadp tr\u00ecnh web n\u00f3i chung, thay v\u00ec ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 c\u00e1c ch\u1ee7 \u0111\u1ec1 c\u1ee7a ri\u00eang eBay (\u0111i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t \u0111\u00fang n\u1ebfu trang c\u1ee7a b\u1ea1n c\u0169ng l\u00e0 trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed gi\u1ed1ng eBay).<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Giam_tai_tren_tat_ca_cac_tai_nguyen_van_ban\"><\/span>Gi\u1ea3m t\u1ea3i tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c t\u00e0i nguy\u00ean v\u0103n b\u1ea3n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>M\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 gi\u00fap trang web t\u1ea3i nhanh h\u01a1n l\u00e0 t\u1ea3i \u00edt m\u00e3 \u0111i (load less code). eBay gi\u1ea3m t\u1ea3i m\u00e3 v\u0103n b\u1ea3n c\u1ee7a h\u1ecd b\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf t\u1ea5t c\u1ea3 c\u00e1c d\u00f2ng m\u00e3 kh\u00f4ng s\u1eed d\u1ee5ng ho\u1eb7c kh\u00f4ng c\u1ea7n thi\u1ebft, bao g\u1ed3m c\u00e1c file JavaScript, CSS, HTML, v\u00e0 c\u00e1c ph\u1ea3n h\u1ed3i JSON ph\u1ee5c v\u1ee5 ng\u01b0\u1eddi d\u00f9ng. Tr\u01b0\u1edbc \u0111\u00e2y, m\u1ed7i khi t\u00ednh n\u0103ng m\u1edbi ra \u0111\u1eddi, eBay l\u1ea1i l\u00e0m gia t\u0103ng th\u1eddi gian ph\u1ea3n h\u1ed3i, v\u00e0 kh\u00f4ng d\u1ecdn d\u1eb9p nh\u1eefng c\u00e1i kh\u00f4ng c\u00f2n s\u1eed d\u1ee5ng n\u1eefa. \u0110i\u1ec1u n\u00e0y l\u00e0m t\u0103ng th\u00eam th\u1eddi gian v\u00e0 c\u00f3 nguy c\u01a1 tr\u1edf th\u00e0nh v\u1ea5n \u0111\u1ec1 t\u1eafc ngh\u1ebdn th\u1eaft c\u1ed5 chai v\u1ec1 hi\u1ec7u su\u1ea5t (performance bottleneck). C\u00e1c \u0111\u1ed9i th\u01b0\u1eddng tr\u00ec ho\u00e3n ho\u1ea1t \u0111\u1ed9ng d\u1ecdn d\u1eb9p, nh\u01b0ng b\u1ea1n s\u1ebd th\u1ea5y ng\u1ea1c nhi\u00ean khi bi\u1ebft eBay \u0111\u00e3 ti\u1ebft ki\u1ec7m nhi\u1ec1u th\u1eddi gian nh\u01b0 th\u1ebf n\u00e0o sau khi quy\u1ebft t\u00e2m th\u1ef1c hi\u1ec7n vi\u1ec7c \u0111\u00f3.<\/p>\n\n\n<p>T\u1eeb &#8220;c\u1eaft&#8221; \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 c\u00e1c byte l\u00e3ng ph\u00ed trong \u0111\u00e1p \u1ee9ng t\u1ea3i c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Duong_dan_quan_trong_de_toi_uu_hoa_cho_noi_dung_thuoc_man_hinh_dau_tien\"><\/span>\u0110\u01b0\u1eddng d\u1eabn quan tr\u1ecdng \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a cho n\u1ed9i dung thu\u1ed9c m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c pixel tr\u00ean m\u00e0n h\u00ecnh \u0111\u1ec1u c\u00f3 m\u1ee9c \u0111\u1ed9 quan tr\u1ecdng nh\u01b0 nhau. <a href=\"https:\/\/kiencang.net\/man-hinh-dau-tien\/\">N\u1ed9i dung n\u1eb1m tr\u00ean m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean<\/a> quan tr\u1ecdng h\u01a1n so v\u1edbi nh\u1eefng n\u1ed9i dung kh\u00e1c n\u1eb1m b\u00ean d\u01b0\u1edbi (below-the-fold). C\u00e1c \u1ee9ng d\u1ee5ng g\u1ed1c v\u00e0 web nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c \u0111i\u1ec1u \u0111\u00f3, nh\u01b0ng c\u00e1c d\u1ecbch v\u1ee5 c\u1ee7a h\u1ecd th\u1ef1c t\u1ebf l\u00e0m th\u1ebf n\u00e0o? Ki\u1ebfn tr\u00fac d\u1ecbch v\u1ee5 c\u1ee7a eBay c\u00f3 m\u1ed9t l\u1edbp g\u1ecdi l\u00e0 D\u1ecbch v\u1ee5 Tr\u1ea3i nghi\u1ec7m (Experience Services), m\u00e0 c\u00e1c frontend (\u1ee9ng d\u1ee5ng g\u1ed1c v\u00e0 d\u1ecbch v\u1ee5 web) giao ti\u1ebfp v\u1edbi. Layer n\u00e0y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t cho l\u01b0\u1ee3t xem ho\u1eb7c d\u1ef1a tr\u00ean thi\u1ebft b\u1ecb (device-based), h\u01a1n l\u00e0 d\u1ef1a tr\u00ean th\u1ef1c th\u1ec3 (entity-based) nh\u01b0 l\u00e0 s\u1ea3n ph\u1ea9m, ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c \u0111\u01a1n \u0111\u1eb7t h\u00e0ng. eBay sau \u0111\u00f3 gi\u1edbi thi\u1ec7u \u00fd t\u01b0\u1edfng v\u1ec1 <a href=\"https:\/\/kiencang.net\/duong-dan-hien-thi-trang-quan-trong\/\">\u0111\u01b0\u1eddng d\u1eabn quan tr\u1ecdng (critical path)<\/a> cho Experience Services. Khi m\u1ed9t y\u00eau c\u1ea7u h\u01b0\u1edbng \u0111\u1ebfn c\u00e1c d\u1ecbch v\u1ee5 c\u1ee7a h\u1ecd, h\u1ecd ti\u1ebfn h\u00e0nh l\u1ea5y d\u1eef li\u1ec7u n\u1ed9i dung n\u1eb1m tr\u00ean m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean (above-the-fold) ngay l\u1eadp t\u1ee9c, b\u1eb1ng c\u00e1ch g\u1ecdi c\u00e1c d\u1ecbch v\u1ee5 upstream kh\u00e1c song song. M\u1ed9t khi d\u1eef li\u1ec7u \u0111\u00e3 s\u1eb5n s\u00e0ng, n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ea9y ra ngay l\u1eadp t\u1ee9c. D\u1eef li\u1ec7u n\u1eb1m d\u01b0\u1edbi m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean s\u1ebd \u0111\u01b0\u1ee3c g\u1eedi \u0111i trong c\u00e1c \u0111o\u1ea1n m\u00e3 sau \u0111\u00f3 ho\u1eb7c \u0111\u01b0\u1ee3c <a href=\"https:\/\/kiencang.net\/ly-giai-don-gian-ve-lazy-load\/\">lazy-load<\/a>. K\u1ebft qu\u1ea3: ng\u01b0\u1eddi d\u00f9ng th\u1ea5y n\u1ed9i dung n\u1eb1m tr\u00ean m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean nhanh h\u01a1n.<\/p>\n\n\n<p>&#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 th\u1eddi gian ti\u00eau t\u1ed1n b\u1edfi c\u00e1c d\u1ecbch v\u1ee5 \u0111\u1ec3 hi\u1ec3n th\u1ecb n\u1ed9i dung li\u00ean quan.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Toi_uu_hoa_hinh_anh\"><\/span>T\u1ed1i \u01b0u h\u00f3a h\u00ecnh \u1ea3nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>H\u00ecnh \u1ea3nh l\u00e0 m\u1ed9t trong c\u00e1c y\u1ebfu t\u1ed1 l\u1edbn nh\u1ea5t g\u00f3p ph\u1ea7n l\u00e0m dung l\u01b0\u1ee3ng trang ph\u00ecnh to (page bloat). Th\u1eadm ch\u00ed c\u00e1c t\u1ed1i \u01b0u h\u00f3a nh\u1ecf th\u00f4i c\u0169ng gi\u00fap \u00edch r\u1ea5t nhi\u1ec1u. eBay th\u1ef1c hi\u1ec7n hai t\u1ed1i \u01b0u h\u00f3a cho \u1ea3nh.<\/p>\n\n\n<p>\u0110\u1ea7u ti\u00ean, eBay chu\u1ea9n h\u00f3a <a href=\"https:\/\/kiencang.net\/dinh-dang-anh-webp\/\">\u0111\u1ecbnh d\u1ea1ng \u1ea3nh WebP<\/a> cho c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c n\u1ec1n t\u1ea3ng, bao g\u1ed3m iOS, Android, v\u00e0 c\u00e1c tr\u00ecnh duy\u1ec7t h\u1ed7 tr\u1ee3 (\u0111\u1ecbnh d\u1ea1ng \u1ea3nh WebP). Trang k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm l\u00e0 trang n\u1eb7ng v\u1ec1 h\u00ecnh \u1ea3nh nh\u1ea5t tr\u00ean eBay, v\u00e0 h\u1ecd c\u0169ng \u0111\u00e3 s\u1eed d\u1ee5ng \u1ea3nh WebP, nh\u01b0ng chuy\u1ec7n n\u00e0y kh\u00f4ng di\u1ec5n ra trong m\u1ed9t m\u00f4 h\u00ecnh nh\u1ea5t qu\u00e1n.<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/eBay-dung-anh-webp-1024x648.png\" alt=\"eBay d\u00f9ng \u1ea3nh WebP\" class=\"wp-image-15186\"\/><figcaption>C\u00e1c \u1ea3nh WebP \u0111\u01b0\u1ee3c eBay s\u1eed d\u1ee5ng tr\u00ean c\u00e1c tr\u00ecnh duy\u1ec7t h\u1ed7 tr\u1ee3 \u0111\u1ecbnh d\u1ea1ng \u1ea3nh n\u00e0y.<\/figcaption><\/figure>\n\n\n<p>Th\u1ee9 hai, m\u1eb7c d\u00f9 c\u00e1c \u1ea3nh n\u1eb1m trong ph\u1ea7n danh m\u1ee5c s\u1ea3n ph\u1ea9m c\u1ee7a eBay \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a r\u1ea5t nhi\u1ec1u (th\u00f4ng qua c\u1ea3 <a href=\"https:\/\/kiencang.net\/kich-thuoc-anh-toi-uu\/\">k\u00edch c\u1ee1<\/a> l\u1eabn \u0111\u1ecbnh d\u1ea1ng), s\u1ef1 nghi\u00eam ng\u1eb7t t\u01b0\u01a1ng t\u1ef1 kh\u00f4ng \u00e1p d\u1ee5ng cho c\u00e1c h\u00ecnh \u1ea3nh tuy\u1ec3n ch\u1ecdn \/ curated image (v\u00ed d\u1ee5, c\u00e1c module n\u1eb1m tr\u00ean c\u00f9ng c\u1ee7a trang ch\u1ee7). eBay c\u00f3 r\u1ea5t nhi\u1ec1u h\u00ecnh \u1ea3nh tuy\u1ec3n ch\u1ecdn, \u0111\u01b0\u1ee3c t\u1ea3i th\u00f4ng qua nhi\u1ec1u c\u00f4ng c\u1ee5. Tr\u01b0\u1edbc \u0111\u00e2y vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a cho c\u00e1c \u1ea3nh n\u00e0y ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o ng\u01b0\u1eddi t\u1ea3i l\u00ean (uploader), nh\u01b0ng gi\u1edd \u0111\u00e2y eBay \u00e1p d\u1ee5ng b\u1eaft bu\u1ed9c c\u00e1c lu\u1eadt t\u1ed1i \u01b0u h\u00f3a v\u00e0o trong c\u00f4ng c\u1ee5, v\u00ec th\u1ebf t\u1ea5t c\u1ea3 c\u00e1c \u1ea3nh t\u1ea3i l\u00ean s\u1ebd \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a m\u1ed9t c\u00e1ch th\u00edch h\u1ee3p.<\/p>\n\n\n<p>&#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 d\u1eef li\u1ec7u \u1ea3nh g\u1eedi \u0111\u1ebfn cho ng\u01b0\u1eddi d\u00f9ng.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Du_doan_tim_nap_truoc_prefetch_cac_tai_nguyen_tinh\"><\/span>D\u1ef1 \u0111o\u00e1n t\u00ecm n\u1ea1p tr\u01b0\u1edbc (prefetch) c\u00e1c t\u00e0i nguy\u00ean t\u0129nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Phi\u00ean l\u00e0m vi\u1ec7c c\u1ee7a ng\u01b0\u1eddi d\u00f9ng (user session) tr\u00ean eBay kh\u00f4ng ch\u1ec9 n\u1eb1m tr\u00ean m\u1ed9t trang. Ng\u01b0\u1eddi d\u00f9ng th\u01b0\u1eddng di chuy\u1ec3n t\u1eeb trang n\u00e0y sang trang kh\u00e1c. L\u1ea5y v\u00ed d\u1ee5, s\u1ef1 di chuy\u1ec3n c\u00f3 th\u1ec3 \u0111i\u1ec1u h\u01b0\u1edbng t\u1eeb trang ch\u1ee7 sang trang t\u00ecm ki\u1ebfm r\u1ed3i t\u1edbi trang m\u00f4 t\u1ea3 s\u1ea3n ph\u1ea9m (item page). V\u1eady t\u1ea1i sao c\u00e1c trang trong lu\u1ed3ng d\u1ecbch chuy\u1ec3n kh\u00f4ng gi\u00fap \u0111\u1ee1 l\u1eabn nhau? \u0110\u00f3 l\u00e0 \u00fd t\u01b0\u1edfng cho ra \u0111\u1eddi m\u00f4 h\u00ecnh <a href=\"https:\/\/kiencang.net\/du-doan-prefetch\/\">d\u1ef1 \u0111o\u00e1n prefetch<\/a>, khi m\u00e0 m\u1ed9t trang c\u00f3 th\u1ec3 t\u00ecm n\u1ea1p tr\u01b0\u1edbc c\u00e1c t\u00e0i nguy\u00ean t\u0129nh \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u trong trang k\u1ebf ti\u1ebfp (m\u00e0 ng\u01b0\u1eddi d\u00f9ng c\u00f3 kh\u1ea3 n\u0103ng s\u1ebd truy c\u1eadp \u0111\u1ebfn).<\/p>\n\n\n<p>V\u1edbi vi\u1ec7c d\u1ef1 \u0111o\u00e1n prefetch, khi ng\u01b0\u1eddi d\u00f9ng \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ebfn trang \u0111\u01b0\u1ee3c d\u1ef1 \u0111o\u00e1n, c\u00e1c t\u00e0i nguy\u00ean \u0111\u00e3 \u0111\u01b0\u1ee3c tr\u00ecnh duy\u1ec7t cache s\u1eb5n r\u1ed3i. \u0110i\u1ec1u n\u00e0y \u00e1p d\u1ee5ng cho c\u00e1c t\u00e0i nguy\u00ean nh\u01b0 CSS v\u00e0 JavaScript, khi m\u00e0 URL c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1ea5y tr\u01b0\u1edbc th\u1eddi h\u1ea1n. M\u1ed9t \u0111i\u1ec1u c\u1ea7n ph\u1ea3i l\u01b0u \u00fd \u1edf \u0111\u00e2y l\u00e0 n\u00f3 ch\u1ec9 gi\u00fap \u00edch cho l\u1ea7n \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ea7u ti\u00ean. C\u00e1c l\u1ea7n \u0111i\u1ec1u h\u01b0\u1edbng ti\u1ebfp theo, c\u00e1c t\u00e0i nguy\u00ean t\u0129nh \u0111\u00e3 c\u00f3 m\u1eb7t trong cache r\u1ed3i.<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/du-doan-tai-nguyen-1024x573.png\" alt=\"d\u1ef1 \u0111o\u00e1n t\u00e0i nguy\u00ean\" class=\"wp-image-15188\"\/><figcaption>eBay th\u1ef1c hi\u1ec7n d\u1ef1 \u0111o\u00e1n prefetching cho c\u00e1c t\u00e0i nguy\u00ean t\u0129nh. Trang ch\u1ee7 prefetch c\u00e1c t\u00e0i nguy\u00ean cho trang t\u00ecm ki\u1ebfm. Trang t\u00ecm ki\u1ebfm prefetch cho trang s\u1ea3n ph\u1ea9m (v\u00e0 c\u1ee9 ti\u1ebfp t\u1ee5c nh\u01b0 v\u1eady). <\/figcaption><\/figure>\n\n\n<p>&#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 gi\u1ea3m th\u1eddi gian t\u1ea3i CSS v\u00e0 JavaScript (c\u0169ng nh\u01b0 c\u00e1c t\u00e0i nguy\u00ean t\u0129nh kh\u00e1c n\u1ebfu c\u00f3) trong l\u1ea7n \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ea7u ti\u00ean (c\u1ee7a truy c\u1eadp k\u1ebf ti\u1ebfp). <a href=\"https:\/\/kiencang.net\/link-prefetch\/\">Link Prefetch<\/a> \u0111\u01b0\u1ee3c eBay d\u1ef1a tr\u00ean h\u1ecdc m\u00e1y v\u00e0 ph\u00e2n t\u00edch trang \u0111\u1ec3 \u0111em l\u1ea1i hi\u1ec7u qu\u1ea3 cao h\u01a1n (v\u00ed d\u1ee5 ch\u1ec9 prefetch c\u00e1c n\u1ed9i dung c\u00f3 x\u00e1c su\u1ea5t \u0111\u01b0\u1ee3c truy c\u1eadp cao, thay v\u00ec prefetch d\u00e0n tr\u1ea3i t\u1ea5t c\u1ea3).<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Prefetch_cac_ket_qua_tim_kiem_dau_tien\"><\/span>Prefetch c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm \u0111\u1ea7u ti\u00ean<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Khi ng\u01b0\u1eddi d\u00f9ng t\u00ecm ki\u1ebfm tr\u00ean eBay, d\u1eef li\u1ec7u ph\u00e2n t\u00edch c\u1ee7a eBay cho th\u1ea5y c\u00f3 kh\u1ea3 n\u0103ng cao ng\u01b0\u1eddi d\u00f9ng s\u1ebd \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ebfn s\u1ea3n ph\u1ea9m n\u1eb1m trong top 10 c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm. V\u00ec th\u1ebf eBay s\u1ebd t\u00ecm n\u1ea1p tr\u01b0\u1edbc c\u00e1c s\u1ea3n ph\u1ea9m t\u1eeb khu v\u1ef1c t\u00ecm ki\u1ebfm v\u00e0 gi\u1eef ch\u00fang s\u1eb5n s\u00e0ng khi ng\u01b0\u1eddi d\u00f9ng th\u1ef1c s\u1ef1 \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ebfn. Prefetch \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u1edf hai c\u1ea5p \u0111\u1ed9.<\/p>\n\n\n<p>C\u1ea5p \u0111\u1ed9 \u0111\u1ea7u ti\u00ean di\u1ec5n ra \u1edf ph\u00eda m\u00e1y ch\u1ee7 (server side), khi d\u1ecbch v\u1ee5 item l\u01b0u tr\u1eef top 10 s\u1ea3n ph\u1ea9m trong c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm. Khi ng\u01b0\u1eddi d\u00f9ng \u0111i \u0111\u1ebfn m\u1ed9t trong c\u00e1c s\u1ea3n ph\u1ea9m n\u00e0y, eBay ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c th\u1eddi gian x\u1eed l\u00fd c\u1ee7a m\u00e1y ch\u1ee7. Cache ph\u00eda m\u00e1y ch\u1ee7 \u0111\u01b0\u1ee3c t\u1eadn d\u1ee5ng c\u1ea3 tr\u00ean c\u00e1c \u1ee9ng d\u1ee5ng g\u1ed1c v\u00e0 \u0111\u01b0\u1ee3c tri\u1ec3n khai tr\u00ean to\u00e0n c\u1ea7u.<\/p>\n\n\n<p>C\u1ea5p \u0111\u1ed9 kh\u00e1c di\u1ec5n ra trong <a href=\"https:\/\/kiencang.net\/bo-nho-dem-trinh-duyet\/\" target=\"_blank\" rel=\"noreferrer noopener\">cache ph\u00eda tr\u00ecnh duy\u1ec7t<\/a>, n\u00f3 hi\u1ec7n \u0111\u01b0\u1ee3c cung c\u1ea5p \u1edf \u00dac. S\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c prefetch l\u00e0 m\u1ed9t t\u1ed1i \u01b0u h\u00f3a n\u00e2ng cao do t\u00ednh ch\u1ea5t \u0111\u1ed9ng t\u1ef1 nhi\u00ean c\u1ee7a c\u00e1c m\u1ee5c. C\u0169ng c\u00f3 nhi\u1ec1u s\u1eafc th\u00e1i cho n\u00f3: s\u1ed1 l\u1ea7n hi\u1ec3n th\u1ecb trang, s\u1ea3n ph\u1ea9m \u0111\u1ea5u gi\u00e1, v\u00e2n v\u00e2n.<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/tai-truoc-ket-qua-tim-kiem-1024x577.png\" alt=\"t\u1ea3i tr\u01b0\u1edbc k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm\" class=\"wp-image-15196\"\/><figcaption>eBay th\u1ef1c hi\u1ec7n prefetch c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm h\u00e0ng \u0111\u1ea7u. eBay prefetch top 5 s\u1ea3n ph\u1ea9m trong trang k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm \u0111\u1ec3 l\u1ea7n truy c\u1eadp sau nhanh h\u01a1n. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra trong th\u1eddi gian r\u1ea3nh r\u1ed7i th\u00f4ng qua requestidleCallback(). eBay nh\u1eadn th\u1ea5y \u1ea3nh h\u01b0\u1edfng t\u00edch c\u1ef1c l\u00ean t\u1ef7 l\u1ec7 chuy\u1ec3n \u0111\u1ed1i th\u00f4ng qua prefetching<\/figcaption><\/figure>\n\n\n<p>&#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 gi\u1ea3m c\u1ea3 th\u1eddi gian x\u1eed l\u00fd ph\u00eda m\u00e1y ch\u1ee7 v\u00e0 th\u1eddi gian t\u1ea3i qua m\u1ea1ng, ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ea3n ph\u1ea9m n\u00e0o \u0111\u01b0\u1ee3c cache.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thuc_day_tai_trong_tim_kiem_hinh_anh\"><\/span>Th\u00fac \u0111\u1ea9y t\u1ea3i trong t\u00ecm ki\u1ebfm h\u00ecnh \u1ea3nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Trong trang k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm, khi m\u1ed9t truy v\u1ea5n \u0111\u01b0\u1ee3c \u0111\u01b0a ra \u1edf c\u1ea5p \u0111\u1ed9 cao, c\u00f3 hai \u0111i\u1ec1u x\u1ea3y ra. B\u01b0\u1edbc m\u1ed9t l\u00e0 tri\u1ec7u h\u1ed3i \/ x\u1ebfp h\u1ea1ng, khi m\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m li\u00ean quan nh\u1ea5t \u0111\u1ebfn truy v\u1ea5n \u0111\u01b0\u1ee3c tr\u1ea3 v\u1ec1. B\u01b0\u1edbc th\u1ee9 hai l\u00e0 t\u0103ng c\u01b0\u1eddng th\u00f4ng tin cho c\u00e1c s\u1ea3n ph\u1ea9m \u0111\u00f3 v\u1edbi c\u00e1c th\u00f4ng tin li\u00ean quan trong b\u1ed1i c\u1ea3nh ng\u01b0\u1eddi d\u00f9ng (user-context) ch\u1eb3ng h\u1ea1n nh\u01b0 chi ph\u00ed giao h\u00e0ng. eBay gi\u1edd g\u1eedi ngay l\u1eadp t\u1ee9c 10 \u1ea3nh s\u1ea3n ph\u1ea9m \u0111\u1ea7u ti\u00ean t\u1edbi tr\u00ecnh duy\u1ec7t trong m\u1ed9t \u0111o\u1ea1n m\u00e3 c\u00f9ng v\u1edbi ti\u00eau \u0111\u1ec1, v\u00ec th\u1ebf vi\u1ec7c t\u1ea3i c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u tr\u01b0\u1edbc khi ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a m\u00e3 \u0111\u00e1nh d\u1ea5u \u0111\u1ebfn n\u01a1i. V\u00e0 h\u1ec7 qu\u1ea3 l\u00e0 c\u00e1c \u1ea3nh s\u1ebb hi\u1ec3n th\u1ecb nhanh h\u01a1n. Thay \u0111\u1ed5i n\u00e0y \u0111\u01b0\u1ee3c tri\u1ec3n khai tr\u00ean to\u00e0n c\u1ea7u cho \u1ee9ng d\u1ee5ng web.<\/p>\n\n\n<p>&#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 gi\u1ea3m th\u1eddi gian b\u1eaft \u0111\u1ea7u t\u1ea3i c\u00e1c h\u00ecnh \u1ea3nh trong k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thuc_day_caching_cho_du_lieu_goi_y_tu_dong_autosuggestion\"><\/span>Th\u00fac \u0111\u1ea9y caching cho d\u1eef li\u1ec7u g\u1ee3i \u00fd t\u1ef1 \u0111\u1ed9ng (autosuggestion)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Khi ng\u01b0\u1eddi d\u00f9ng g\u00f5 c\u00e1c k\u00fd t\u1ef1 trong \u00f4 t\u00ecm ki\u1ebfm (search box), c\u00e1c g\u1ee3i \u00fd s\u1ebd b\u1eadt ra. C\u00e1c g\u1ee3i \u00fd n\u00e0y kh\u00f4ng thay \u0111\u1ed5i cho c\u00e1c k\u1ebft h\u1ee3p k\u00fd t\u1ef1 trong \u00edt nh\u1ea5t m\u1ed9t ng\u00e0y. Ch\u00fang l\u00e0 c\u00e1c \u1ee9ng c\u1eed vi\u00ean l\u00fd t\u01b0\u1edfng cho cache v\u00e0 \u0111\u01b0\u1ee3c ph\u1ee5c v\u1ee5 t\u1eeb CDN (t\u1ed1i \u0111a 24 gi\u1edd), thay v\u00ec c\u00e1c y\u00eau c\u1ea7u g\u1eedi \u0111\u1ebfn trung t\u00e2m d\u1eef li\u1ec7u (c\u00e1i s\u1ebd ch\u1eadm h\u01a1n). Th\u1ecb tr\u01b0\u1eddng qu\u1ed1c t\u1ebf \u0111\u1eb7c bi\u1ec7t nh\u1eadn \u0111\u01b0\u1ee3c nhi\u1ec1u l\u1ee3i \u00edch t\u1eeb caching CDN (xem th\u00eam <a href=\"https:\/\/kiencang.net\/cdn-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">CDN l\u00e0 g\u00ec<\/a>).<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/du-lieu-goi-y-1024x533.png\" alt=\"g\u1ee3i \u00fd d\u1eef li\u1ec7u JavaScript\" class=\"wp-image-15199\"\/><\/figure>\n\n\n<p>M\u1eb7c d\u00f9 c\u00f3 b\u1eaby nh\u1ea5t \u0111\u1ecbnh. eBay c\u00f3 m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 c\u00e1 nh\u00e2n h\u00f3a trong g\u1ee3i \u00fd b\u1eadt l\u00ean (pop-up), c\u00e1i kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c cache hi\u1ec7u qu\u1ea3. May m\u1eafn, n\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ea5n \u0111\u1ec1 trong \u1ee9ng d\u1ee5ng g\u1ed1c, v\u00ec giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec3 c\u00e1 nh\u00e2n h\u00f3a v\u00e0 c\u00e1c g\u1ee3i \u00fd \u0111\u1ec1 xu\u1ea5t c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00e1ch ra. Trong th\u1ebf gi\u1edbi web, \u1edf th\u1ecb tr\u01b0\u1eddng qu\u1ed1c t\u1ebf, \u0111\u1ed9 tr\u1ec5 l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 quan tr\u1ecdng h\u01a1n so v\u1edbi l\u1ee3i \u00edch nh\u1ecf c\u1ee7a c\u00e1 nh\u00e2n h\u00f3a. V\u1edbi c\u00e1ch l\u00e0m \u0111\u00f3, eBay gi\u1edd t\u1ef1 \u0111\u1ed9ng g\u1ee3i \u00fd t\u1eeb cache CDN to\u00e0n c\u1ea7u cho \u1ee9ng d\u1ee5ng g\u1ed1c v\u00e0 th\u1ecb tr\u01b0\u1eddng kh\u00f4ng ph\u1ea3i Hoa K\u1ef3 cho eBay.com.<\/p>\n\n\n<p>&#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y l\u00e0 gi\u1ea3m \u0111\u1ed9 tr\u1ec5 m\u1ea1ng v\u00e0 th\u1eddi gian x\u1eed l\u00fd m\u00e1y ch\u1ee7 cho v\u1ea5n \u0111\u1ec1 t\u1ef1 \u0111\u1ed9ng g\u1ee3i \u00fd (autosuggestions).<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thuc_day_cache_cho_trang_chu_cua_nguoi_dung_chua_duoc_nhan_dien_nhung_ai_chua_dang_nhap\"><\/span>Th\u00fac \u0111\u1ea9y cache cho trang ch\u1ee7 c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ch\u01b0a \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n (nh\u1eefng ai ch\u01b0a \u0111\u0103ng nh\u1eadp)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>V\u1edbi n\u1ec1n t\u1ea3ng web, n\u1ed9i dung trang ch\u1ee7 cho ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n l\u00e0 gi\u1ed1ng nhau cho khu v\u1ef1c c\u1ee5 th\u1ec3. \u0110\u00e2y l\u00e0 nh\u1eefng ng\u01b0\u1eddi d\u00f9ng l\u1ea7n \u0111\u1ea7u ti\u00ean s\u1eed d\u1ee5ng eBay ho\u1eb7c b\u1eaft \u0111\u1ea7u l\u00e0m m\u1edbi session, do \u0111\u00f3 kh\u00f4ng ph\u1ea3i c\u00e1 nh\u00e2n h\u00f3a. M\u1eb7c d\u00f9 trang ch\u1ee7 c\u00f3 c\u00e1c thay \u0111\u1ed5i th\u01b0\u1eddng xuy\u00ean nh\u01b0ng v\u1eabn c\u00f3 ch\u1ed7 cho caching.<\/p>\n\n\n<p>eBay quy\u1ebft \u0111\u1ecbnh cache n\u1ed9i dung cho ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n (HTML) tr\u00ean m\u1ea1ng m\u00e1y ch\u1ee7 bi\u00ean (PoPs) trong m\u1ed9t kho\u1ea3ng th\u1eddi gian ng\u1eafn. Ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp l\u1ea7n \u0111\u1ea7u ti\u00ean gi\u1edd c\u00f3 th\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c n\u1ed9i dung trang ch\u1ee7 t\u1eeb m\u00e1y ch\u1ee7 g\u1ea7n h\u1ecd, thay v\u00ec t\u1eeb trung t\u00e2m d\u1eef li\u1ec7u xa. eBay v\u1eabn \u0111ang th\u1eed nghi\u1ec7m \u0111i\u1ec1u n\u00e0y cho th\u1ecb tr\u01b0\u1eddng qu\u1ed1c t\u1ebf, n\u01a1i m\u00e0 n\u00f3 s\u1ebd c\u00f3 \u1ea3nh h\u01b0\u1edfng l\u1ee3i \u00edch l\u1edbn h\u01a1n.<\/p>\n\n\n<p>&#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y m\u1ed9t l\u1ea7n n\u1eefa l\u00e0 gi\u1ea3m \u0111\u1ed9 tr\u1ec5 m\u1ea1ng (network latency) v\u00e0 th\u1eddi gian x\u1eed l\u00fd m\u00e1y ch\u1ee7 (server processing time) cho ng\u01b0\u1eddi d\u00f9ng ch\u01b0a \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Toi_uu_hoa_cho_cac_nen_tang_khac\"><\/span>T\u1ed1i \u01b0u h\u00f3a cho c\u00e1c n\u1ec1n t\u1ea3ng kh\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p><strong>C\u1ea3i thi\u1ec7n ph\u00e2n t\u00edch cho \u1ee9ng d\u1ee5ng g\u1ed1c<\/strong><\/p>\n\n\n<p>\u1ee8ng d\u1ee5ng g\u1ed1c (iOS v\u00e0 Android) giao ti\u1ebfp v\u1edbi c\u00e1c d\u1ecbch v\u1ee5 backend-nh\u1eefng c\u00e1i c\u00f3 \u0111\u1ecbnh d\u1ea1ng ph\u1ea3n h\u1ed3i th\u01b0\u1eddng l\u00e0 JSON. C\u00e1c t\u1ea3i tr\u1ecdng JSON n\u00e0y c\u00f3 th\u1ec3 l\u1edbn. Thay v\u00ec ph\u00e2n t\u00edch c\u00fa ph\u00e1p to\u00e0n b\u1ed9 JSON v\u00e0 render m\u1ed9t s\u1ed1 c\u00e1i tr\u00ean m\u00e0n h\u00ecnh, eBay gi\u1edbi thi\u1ec7u thu\u1eadt to\u00e1n ph\u00e2n t\u00edch c\u00fa ph\u00e1p hi\u1ec7u qu\u1ea3 h\u01a1n t\u1ed1i \u01b0u h\u00f3a cho n\u1ed9i dung c\u1ea7n hi\u1ec3n th\u1ecb ngay l\u1eadp t\u1ee9c.<\/p>\n\n\n<p>Ng\u01b0\u1eddi d\u00f9ng gi\u1edd \u0111\u00e2y c\u00f3 th\u1ec3 th\u1ea5y n\u1ed9i dung hi\u1ec3n th\u1ecb nhanh h\u01a1n. Th\u00eam v\u00e0o \u0111\u00f3, v\u1edbi \u1ee9ng d\u1ee5ng Android, eBay b\u1eaft \u0111\u1ea7u kh\u1edfi t\u1ea1o b\u1ed9 \u0111i\u1ec1u khi\u1ec3n t\u00ecm ki\u1ebfm s\u1edbm nh\u1ea5t c\u00f3 th\u1ec3 khi ng\u01b0\u1eddi d\u00f9ng b\u1eaft \u0111\u1ea7u g\u00f5 v\u00e0o \u00f4 t\u00ecm ki\u1ebfm (iOS \u0111\u00e3 c\u00f3 s\u1eb5n t\u00ednh n\u0103ng t\u1ed1i \u01b0u h\u00f3a n\u00e0y). Tr\u01b0\u1edbc \u0111\u00f3, \u0111i\u1ec1u n\u00e0y ch\u1ec9 x\u1ea3y ra khi ng\u01b0\u1eddi s\u1eed d\u1ee5ng nh\u1ea5n v\u00e0o n\u00fat t\u00ecm ki\u1ebfm. Gi\u1edd \u0111\u00e2y ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm nhanh h\u01a1n. &#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 gi\u1ea3m th\u1eddi gian m\u00e0 thi\u1ebft b\u1ecb c\u1ea7n \u0111\u1ec3 hi\u1ec3n th\u1ecb n\u1ed9i dung li\u00ean quan.<\/p>\n\n\n<p><strong> C\u1ea3i thi\u1ec7n th\u1eddi gian kh\u1edfi \u0111\u1ed9ng c\u1ee7a \u1ee9ng d\u1ee5ng g\u1ed1c<\/strong><\/p>\n\n\n<p>\u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho v\u1ea5n \u0111\u1ec1 t\u1ed1i \u01b0u h\u00f3a th\u1eddi gian kh\u1edfi \u0111\u1ed9ng ngu\u1ed9i cho \u1ee9ng d\u1ee5ng g\u1ed1c, c\u1ee5 th\u1ec3 \u1edf \u0111\u00e2y l\u00e0 Android. Khi \u1ee9ng d\u1ee5ng (app) kh\u1edfi \u0111\u1ed9ng ngu\u1ed9i, c\u00f3 r\u1ea5t nhi\u1ec1u kh\u1edfi t\u1ea1o x\u1ea3y ra c\u1ea3 \u1edf c\u1ea5p \u0111\u1ed9 OS (h\u1ec7 \u0111i\u1ec1u h\u00e0nh) v\u00e0 c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng (application level). Gi\u1ea3m th\u1eddi gian kh\u1edfi t\u1ea1o \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng gi\u00fap ng\u01b0\u1eddi d\u00f9ng th\u1ea5y m\u00e0n h\u00ecnh ch\u00ednh (home screen) nhanh h\u01a1n. eBay \u0111\u00e3 th\u1ef1c hi\u1ec7n m\u1ed9t s\u1ed1 th\u1eed nghi\u1ec7m v\u00e0 nh\u1eadn th\u1ea5y r\u1eb1ng kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c kh\u1edfi t\u1ea1o ban \u0111\u1ea7u \u0111\u1ec1u c\u1ea7n \u0111\u1ec3 hi\u1ec3n th\u1ecb n\u1ed9i dung v\u00e0 m\u1ed9t s\u1ed1 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c tr\u00ec ho\u00e3n.<\/p>\n\n\n<p>\u0110i\u1ec1u quan tr\u1ecdng h\u01a1n, eBay quan s\u00e1t th\u1ea5y c\u00f3 c\u00e1c m\u00e3 ph\u00e2n t\u00edch c\u1ee7a b\u00ean th\u1ee9 ba ch\u1eb7n hi\u1ec3n th\u1ecb l\u00e0m tr\u00ec ho\u00e3n vi\u1ec7c render tr\u00ean m\u00e0n h\u00ecnh. Lo\u1ea1i b\u1ecf c\u00e1c l\u1eddi g\u1ecdi ch\u1eb7n n\u00e0y v\u00e0 l\u00e0m n\u00f3 t\u1ea3i kh\u00f4ng h\u01a1n n\u1eefa gi\u00fap c\u1ea3i thi\u1ec7n th\u1eddi gian kh\u1edfi \u0111\u1ed9ng ngu\u1ed9i. &#8220;C\u1eaft&#8221; \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 gi\u1ea3m b\u1edbt th\u1eddi gian kh\u1edfi \u0111\u1ed9ng kh\u00f4ng c\u1ea7n thi\u1ebft cho \u1ee9ng d\u1ee5ng g\u1ed1c.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ket_luan\"><\/span>K\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>T\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec1u ch\u1ec9nh hi\u1ec7u su\u1ea5t tr\u00ean eBay \u0111\u00f3ng g\u00f3p v\u00e0o vi\u1ec7c t\u1ea1o ra s\u1ef1 thay \u0111\u1ed5i t\u00edch c\u1ef1c v\u1ec1 t\u1ed1c \u0111\u1ed9, v\u00e0 n\u00f3 di\u1ec5n ra kh\u00f4ng ph\u1ea3i ngay l\u1eadp t\u1ee9c m\u00e0 trong m\u1ed9t kho\u1ea3ng th\u1eddi gian. C\u00e1c b\u1ea3n ph\u00e1t h\u00e0nh \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong su\u1ed1t c\u1ea3 n\u0103m, v\u1edbi t\u1eebng b\u1ea3n ph\u00e1t h\u00e0nh ti\u1ebft ki\u1ec7m v\u00e0i ch\u1ee5c mili gi\u00e2y, cu\u1ed1i c\u00f9ng gi\u00fap eBay \u0111\u1ea1t \u0111\u1ebfn \u0111i\u1ec3m s\u1ed1 nh\u01b0 b\u00e2y gi\u1edd:<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/FCP-eBay-1024x677.png\" alt=\"FCP c\u1ee7a eBay\" class=\"wp-image-15208\"\/><figcaption>\u1ea2nh h\u01b0\u1edfng c\u1ee7a c\u00e1c n\u1ed7 l\u1ef1c t\u0103ng t\u1ed1c c\u1ee7a eBay \u0111\u01b0\u1ee3c ph\u1ea3n \u00e1nh qua c\u00e1c ch\u1ec9 s\u1ed1 theo chi\u1ec1u d\u00e0i th\u1eddi gian, \u0111\u01b0\u1ee3c minh h\u1ecda d\u1ef1a tr\u00ean Chrome UX Report Dashboard<\/figcaption><\/figure>\n\n\n<p>Hi\u1ec7u su\u1ea5t l\u00e0 m\u1ed9t t\u00ednh n\u0103ng v\u00e0 l\u00e0 m\u1ed9t l\u1ee3i th\u1ebf c\u1ea1nh tranh. T\u1ed1i \u01b0u h\u00f3a tr\u1ea3i nghi\u1ec7m d\u1eabn \u0111\u1ebfn kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c ng\u01b0\u1eddi d\u00f9ng, chuy\u1ec3n \u0111\u1ed5i v\u00e0 ROI cao h\u01a1n. Trong tr\u01b0\u1eddng h\u1ee3p c\u1ee7a eBay, c\u00e1c t\u1ed1i \u01b0u h\u00f3a n\u00e0y thay \u0111\u1ed5i t\u1eeb c\u00e1c n\u1ed7 l\u1ef1c \u0111\u01a1n gi\u1ea3n cho \u0111\u1ebfn m\u1ed9t s\u1ed1 c\u00e1i n\u00e2ng cao.<\/p>\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft Shopping for speed on eBay.com, t\u00e1c gi\u1ea3: Addy Osmani, website: web[.]dev)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi d\u1ecbch: T\u1ed1i \u01b0u h\u00f3a trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed kh\u00f3 kh\u0103n h\u01a1n c\u00e1c trang b\u00e1o \u0111i\u1ec7n t\u1eed th\u00f4ng th\u01b0\u1eddng. Nguy\u00ean nh\u00e2n \u1edf ch\u1ed7 trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u t\u00ednh n\u0103ng \u0111a d\u1ea1ng, \u0111\u00f2i h\u1ecfi c\u00e1 nh\u00e2n h\u00f3a, b\u1ea3o m\u1eadt, c\u0169ng nh\u01b0 y\u00eau c\u1ea7u t\u00ednh \u0111\u1ed9ng cao h\u01a1n &hellip;<\/p>\n","protected":false},"author":1,"featured_media":15184,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[293],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>T\u0103ng t\u1ed1c mua h\u00e0ng tr\u00ean eBay.com &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"description\" content=\"T\u1ea5t nhi\u00ean thu nh\u1eadp c\u1ee7a b\u1ea1n kh\u00f4ng b\u1eb1ng eBay r\u1ed3i, nh\u01b0ng n\u1ebfu b\u1ea1n c\u00f3 m\u1ed9t trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, c\u00e1c kinh nghi\u1ec7m c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 web c\u1ee7a h\u1ecd r\u1ea5t c\u00f3 \u00edch \u0111\u1ea5y.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/tang-toc-mua-hang-ebay\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"T\u0103ng t\u1ed1c mua h\u00e0ng tr\u00ean eBay.com &#8226; 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