{"id":14765,"date":"2020-03-04T22:59:38","date_gmt":"2020-03-04T15:59:38","guid":{"rendered":"https:\/\/kiencang.net\/?p=14765"},"modified":"2020-03-04T22:59:38","modified_gmt":"2020-03-04T15:59:38","slug":"preload-preconnect-prefetch","status":"publish","type":"post","link":"https:\/\/kiencang.net\/preload-preconnect-prefetch\/","title":{"rendered":"C\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 website b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng preload, preconnect, prefetch"},"content":{"rendered":"\n<p>Ng\u00e0y h\u00f4m nay t\u00f4i s\u1ebd tr\u00ecnh b\u00e0y m\u1ed9t v\u00e0i k\u1ef9 thu\u1eadt \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 <a href=\"https:\/\/kiencang.net\/tang-toc-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">gi\u00fap website c\u1ee7a b\u1ea1n t\u1ea3i nhanh h\u01a1n<\/a>.<\/p>\n\n\n<p>\u0110\u1ea7u ti\u00ean, ch\u00fang ta c\u1ea7n bi\u1ebft preload, preconnect v\u00e0 prefetch l\u00e0 g\u00ec \u0111\u00e3.<\/p>\n\n\n<p><strong><a href=\"https:\/\/kiencang.net\/preload-tai-nguyen-quan-trong\/\" target=\"_blank\" rel=\"noreferrer noopener\">Preload<\/a><\/strong> &#8211; Khi ch\u00fang ta s\u1eed d\u1ee5ng preload trong tag link, tr\u00ecnh duy\u1ec7t s\u1ebd ti\u1ebfn h\u00e0nh t\u00ecm n\u1ea1p s\u1edbm y\u00eau c\u1ea7u \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c t\u00e0i nguy\u00ean m\u00e0 website c\u1ea7n. C\u00e1i n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng ch\u1ee7 y\u1ebfu v\u00e0o c\u00e1c t\u00e0i nguy\u00ean c\u00f3 m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean cao trong <em>phi\u00ean l\u00e0m vi\u1ec7c hi\u1ec7n t\u1ea1i<\/em>, b\u1ea5t k\u1ec3 n\u00f3 l\u00e0 t\u00e0i nguy\u00ean thu\u1ed9c hosting g\u1ed1c hay c\u1ee7a b\u00ean th\u1ee9 ba (thirt-party).<\/p>\n\n\n<p><strong><a href=\"https:\/\/kiencang.net\/su-dung-preconnect\/\" target=\"_blank\" rel=\"noreferrer noopener\">Preconnect<\/a><\/strong> &#8211; N\u00f3 gi\u1ea3i gi\u00fap quy\u1ebft v\u1ea5n \u0111\u1ec1 <a href=\"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/\" target=\"_blank\" rel=\"noreferrer noopener\">tra c\u1ee9u DNS<\/a> v\u00e0 TCP handshaking\/https. Ch\u1ec9 d\u00e0nh cho t\u00e0i nguy\u00ean c\u1ee7a b\u00ean th\u1ee9 ba, k\u1ec3 c\u1ea3 l\u00e0 <a href=\"https:\/\/kiencang.net\/cdn-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">CDN<\/a> (ki\u1ec3u cdn.ten-mien-cua-ban.com), n\u00f3 kh\u00f4ng c\u1ea7n thi\u1ebft cho c\u00e1c t\u00e0i nguy\u00ean thu\u1ed9c host g\u1ed1c.<\/p>\n\n\n<p><strong>DNS-Preconnect<\/strong> &#8211; N\u00f3 ch\u1ec9 gi\u00fap gi\u1ea3i quy\u1ebft tra c\u1ee9u DNS v\u00e0 c\u0169ng ch\u1ec9 d\u00e0nh cho t\u00e0i nguy\u00ean c\u1ee7a b\u00ean th\u1ee9 ba. C\u00e1i n\u00e0y k\u00e9m h\u01a1n so v\u1edbi preconnect l\u00e0 n\u00f3 kh\u00f4ng th\u1ef1c hi\u1ec7n c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn k\u1ebft n\u1ed1i tr\u01b0\u1edbc, h\u00ecnh th\u00e0nh li\u00ean k\u1ebft b\u1ea3o m\u1eadt (https).<\/p>\n\n\n<p><strong><a href=\"https:\/\/kiencang.net\/link-prefetch\/\" target=\"_blank\" rel=\"noreferrer noopener\">Prefetch<\/a><\/strong> &#8211; N\u00f3 gi\u00fap t\u00ecm n\u1ea1p tr\u01b0\u1edbc c\u00e1c ngu\u1ed3n t\u00e0i nguy\u00ean v\u00e0 \u0111\u01b0a n\u00f3 v\u00e0o trong cache tr\u00ecnh duy\u1ec7t \u0111\u1ec3 khi ng\u01b0\u1eddi d\u00f9ng c\u1ea7n t\u00e0i nguy\u00ean th\u00ec tr\u00ecnh duy\u1ec7t s\u1ebd l\u1ea5y t\u1eeb \u0111\u00e2y thay v\u00ec ph\u1ea3i th\u1ef1c hi\u1ec7n y\u00eau c\u1ea7u theo th\u1eddi gian th\u1ef1c. \u0110i\u1ec3m kh\u00e1c bi\u1ec7t v\u1edbi preload l\u00e0 vi\u1ec7c t\u00ecm n\u1ea1p tr\u01b0\u1edbc n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n khi r\u1ea3nh r\u1ed7i trong phi\u00ean hi\u1ec7n t\u1ea1i, v\u00e0 c\u00e1c t\u00e0i nguy\u00ean t\u00ecm n\u1ea1p tr\u01b0\u1edbc l\u00e0 d\u00e0nh cho l\u01b0\u1ee3t gh\u00e9 th\u0103m\/click <strong>k\u1ebf ti\u1ebfp<\/strong> ch\u1ee9 kh\u00f4ng ph\u1ea3i hi\u1ec7n t\u1ea1i. H\u1ec7 qu\u1ea3 l\u00e0 n\u1ebfu \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng c\u1ea9n tr\u1ecdng, trang website s\u1ebd t\u1ea3i nhanh h\u01a1n r\u1ea5t nhi\u1ec1u, v\u00ec <em>n\u1ed9i dung m\u00e0 ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp trong t\u01b0\u01a1ng lai \u0111\u00e3 \u0111\u01b0\u1ee3c cache<\/em>. \u0110\u00e2y l\u00e0 c\u00e1ch m\u00e0 <a href=\"https:\/\/kiencang.net\/plugin-flying-pages\/\" target=\"_blank\" rel=\"noreferrer noopener\">plugin Flying Pages<\/a> \u00e1p d\u1ee5ng.<\/p>\n\n\n<p class=\"has-background\" style=\"background-color:#dddddd\">T\u00f4i ngh\u0129 b\u1ea1n c\u00f3 th\u1ec3 v\u1eabn c\u1ea3m th\u1ea5y l\u1eabn l\u1ed9n gi\u1eefa preload v\u00e0 prefetch. M\u1ed9t \u0111i\u1ec3m kh\u00e1c bi\u1ec7t quan tr\u1ecdng l\u00e0 preload \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho c\u00e1c t\u00e0i nguy\u00ean c\u00f3 m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean cao, c\u00f2n prefetch \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho c\u00e1c t\u00e0i nguy\u00ean c\u00f3 m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean th\u1ea5p.<\/p>\n\n\n<p>Gi\u1edd ch\u00fang ta s\u1ebd xem v\u00ed d\u1ee5 trong th\u1ef1c t\u1ebf.<\/p>\n\n\n<p>M\u1eb7c \u0111\u1ecbnh th\u00ec website <em>vuejs<\/em> c\u1ee7a t\u00f4i (t\u00e1c gi\u1ea3 g\u1ed1c b\u00e0i ti\u1ebfng Anh) kh\u00f4ng s\u1eed d\u1ee5ng b\u1ea5t c\u1ee9 ph\u01b0\u01a1ng th\u1ee9c n\u00e0o b\u00ean tr\u00ean.<\/p>\n\n\n<p>Gi\u1edd ch\u00fang ta ki\u1ec3m tra hi\u1ec7u su\u1ea5t c\u1ee7a trang b\u1eb1ng c\u00f4ng c\u1ee5 Chrome Audits (lighthouse).<\/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\/hieu-suat-vuejs-2.png\" alt=\"hi\u1ec7u su\u1ea5t c\u1ee7a trang VueJS\" class=\"wp-image-14766\"\/><figcaption>Hi\u1ec7u su\u1ea5t c\u1ee7a trang VueJS<\/figcaption><\/figure><\/div>\n\n\n<p>B\u1ea1n c\u00f3 th\u1ea5y hi\u1ec7u su\u1ea5t c\u1ee7a trang \u0111ang \u1edf m\u1ed1c 43%.<\/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-6577d6cf8a8af\" ><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-6577d6cf8a8af\"  type=\"checkbox\" id=\"item-6577d6cf8a8af\"><\/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\/preload-preconnect-prefetch\/#Sau_khi_toi_su_dung_preconnect_va_preload\" title=\"Sau khi t\u00f4i s\u1eed d\u1ee5ng preconnect v\u00e0 preload\">Sau khi t\u00f4i s\u1eed d\u1ee5ng preconnect v\u00e0 preload<\/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\/preload-preconnect-prefetch\/#Chung_ta_cung_xem_mot_so_trang_web_lon_su_dung_cac_bien_phap_goi_y_tai_nguyen_o_tren_nhu_the_nao\" title=\"Ch\u00fang ta c\u00f9ng xem m\u1ed9t s\u1ed1 trang web l\u1edbn s\u1eed d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p g\u1ee3i \u00fd t\u00e0i nguy\u00ean \u1edf tr\u00ean nh\u01b0 th\u1ebf n\u00e0o\">Ch\u00fang ta c\u00f9ng xem m\u1ed9t s\u1ed1 trang web l\u1edbn s\u1eed d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p g\u1ee3i \u00fd t\u00e0i nguy\u00ean \u1edf tr\u00ean nh\u01b0 th\u1ebf n\u00e0o<\/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\/preload-preconnect-prefetch\/#Giai_thich_de_hieu_hon_ve_cac_thuoc_tinh_preload_preconnect_va_prefetch\" title=\"Gi\u1ea3i th\u00edch d\u1ec5 hi\u1ec3u h\u01a1n v\u1ec1 c\u00e1c thu\u1ed9c t\u00ednh preload, preconnect v\u00e0 prefetch\">Gi\u1ea3i th\u00edch d\u1ec5 hi\u1ec3u h\u01a1n v\u1ec1 c\u00e1c thu\u1ed9c t\u00ednh preload, preconnect v\u00e0 prefetch<\/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\/preload-preconnect-prefetch\/#Lam_sao_biet_duoc_tai_nguyen_nao_thi_nen_%E2%80%98pre_va_dung_thuoc_tinh_cu_the_nao_voi_tai_nguyen_do\" title=\"L\u00e0m sao bi\u1ebft \u0111\u01b0\u1ee3c t\u00e0i nguy\u00ean n\u00e0o th\u00ec n\u00ean &#8216;pre&#8217; v\u00e0 d\u00f9ng thu\u1ed9c t\u00ednh c\u1ee5 th\u1ec3 n\u00e0o v\u1edbi t\u00e0i nguy\u00ean \u0111\u00f3\">L\u00e0m sao bi\u1ebft \u0111\u01b0\u1ee3c t\u00e0i nguy\u00ean n\u00e0o th\u00ec n\u00ean &#8216;pre&#8217; v\u00e0 d\u00f9ng thu\u1ed9c t\u00ednh c\u1ee5 th\u1ec3 n\u00e0o v\u1edbi t\u00e0i nguy\u00ean \u0111\u00f3<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sau_khi_toi_su_dung_preconnect_va_preload\"><\/span>Sau khi t\u00f4i s\u1eed d\u1ee5ng preconnect v\u00e0 preload<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Gi\u1edd hi\u1ec7u su\u1ea5t c\u1ee7a trang l\u00e0 78%.<\/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\/hieu-suat-tang-len.png\" alt=\"hi\u1ec7u su\u1ea5t c\u1ee7a trang t\u0103ng l\u00ean\" class=\"wp-image-14767\"\/><figcaption>Hi\u1ec7u su\u1ea5t c\u1ee7a trang t\u0103ng l\u00ean<\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Chung_ta_cung_xem_mot_so_trang_web_lon_su_dung_cac_bien_phap_goi_y_tai_nguyen_o_tren_nhu_the_nao\"><\/span>Ch\u00fang ta c\u00f9ng xem m\u1ed9t s\u1ed1 trang web l\u1edbn s\u1eed d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p g\u1ee3i \u00fd t\u00e0i nguy\u00ean \u1edf tr\u00ean nh\u01b0 th\u1ebf n\u00e0o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<h3 class=\"wp-block-heading\">1. Amazon<\/h3>\n\n\n<p>Trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed h\u00e0ng \u0111\u1ea7u th\u1ebf gi\u1edbi.<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/amazon.png\" alt=\"Amazon s\u1eed d\u1ee5ng dns-prefetch\" class=\"wp-image-14769\"\/><figcaption>Amazon s\u1eed d\u1ee5ng dns-prefetch cho c\u00e1c t\u00e0i nguy\u00ean b\u00ean th\u1ee9 ba<\/figcaption><\/figure>\n\n\n<h3 class=\"wp-block-heading\">2. Github<\/h3>\n\n\n<p>Trang web d\u00e0nh cho l\u1eadp tr\u00ecnh vi\u00ean.<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/github.png\" alt=\"\" class=\"wp-image-14770\"\/><figcaption>Github c\u0169ng ch\u1ee7 y\u1ebfu s\u1eed d\u1ee5ng dns-prefetch<\/figcaption><\/figure>\n\n\n<h3 class=\"wp-block-heading\">3. Netflix<\/h3>\n\n\n<p>C\u00f4ng ty cho xem phim tr\u1ef1c tuy\u1ebfn thu ph\u00ed h\u00e0ng \u0111\u1ea7u th\u1ebf gi\u1edbi.<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/netflix.png\" alt=\"Netflix s\u1eed d\u1ee5ng preload\" class=\"wp-image-14771\"\/><figcaption>Netflix s\u1eed d\u1ee5ng preload cho nhi\u1ec1u file js<\/figcaption><\/figure>\n\n\n<h3 class=\"wp-block-heading\">4. WP Speed Matters<\/h3>\n\n\n<p>Trang web cung c\u1ea5p n\u1ed9i dung v\u1ec1 c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 website chuy\u00ean cho WordPress.<\/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\/wpspeedmatters.png\" alt=\"c\u00e1c thu\u1ed9c t\u00ednh pre c\u1ee7a trang WPspeedmatters\" class=\"wp-image-14775\"\/><figcaption>WP Speed Matters s\u1eed d\u1ee5ng dns-prefetch cho GA (google-analytics.com) v\u00e0 CDN, preconnect cho font c\u1ee7a b\u00ean th\u1ee9 ba (fonts.gstatic.com) v\u00e0 preload cho font local host (.woff)<\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Giai_thich_de_hieu_hon_ve_cac_thuoc_tinh_preload_preconnect_va_prefetch\"><\/span>Gi\u1ea3i th\u00edch d\u1ec5 hi\u1ec3u h\u01a1n v\u1ec1 c\u00e1c thu\u1ed9c t\u00ednh preload, preconnect v\u00e0 prefetch<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>C\u00e1i m\u00e0 ch\u00fang ta c\u1ea7n n\u1eafm b\u1eaft trong c\u1ea3 b\u1ed1n thu\u1ed9c t\u00ednh tr\u00ean l\u00e0 &#8216;pre\/t\u1ea3i tr\u01b0\u1edbc\/l\u00e0m tr\u01b0\u1edbc&#8217;.<\/p>\n\n\n<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea1n mu\u1ed1n x\u00e2y c\u0103n nh\u00e0 m\u1edbi, b\u1ea1n s\u1ebd mua + l\u00e0m nh\u1eefng th\u1ee9 g\u00ec \u0111\u1ec3 chu\u1ea9n b\u1ecb? C\u00f3 2 ph\u01b0\u01a1ng \u00e1n:<\/p>\n\n\n<ul><li>A. B\u1ea1n mua xi m\u0103ng, c\u00e1t s\u1ecfi, s\u1eaft th\u00e9p, g\u1ea1ch + b\u1ea3n thi\u1ebft k\u1ebf c\u01a1 b\u1ea3n v\u1ec1 c\u0103n nh\u00e0;<\/li><li>B. B\u1ea1n mua b\u1ed3n t\u1eafm, b\u1ed3n v\u1ec7 sinh, b\u1ed3n r\u1eeda b\u00e1t, b\u00ecnh n\u00f3ng l\u1ea1nh + l\u00ean danh s\u00e1ch kh\u00e1ch d\u1ef1 ti\u1ec7c nh\u00e0 m\u1edbi;<\/li><\/ul>\n\n\n<p>R\u00f5 r\u00e0ng l\u00e0 b\u1ea1n n\u00ean ch\u1ecdn ph\u01b0\u01a1ng \u00e1n A. Kh\u00f4ng ph\u1ea3i nh\u1eefng \u0111\u1ed3 v\u1eadt, c\u00f4ng vi\u1ec7c \u1edf ph\u01b0\u01a1ng \u00e1n B kh\u00f4ng quan tr\u1ecdng- ng\u01b0\u1ee3c l\u1ea1i, v\u1ec1 sau b\u1ea1n h\u1ea7u nh\u01b0 ch\u1ec9 \u0111\u1ec3 \u00fd \u0111\u1ebfn c\u00e1c \u0111\u1ed3 v\u1eadt B m\u00e0 qu\u00ean m\u1ea5t s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a xi m\u0103ng, c\u00e1t s\u1ecfi, s\u1eaft th\u00e9p, v\u00e2n v\u00e2n. Th\u1ebf nh\u01b0ng \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u0103n nh\u00e0 nhanh ch\u00f3ng, thu\u1eadn l\u1ee3i b\u1ea1n ph\u1ea3i mua c\u00e1c \u0111\u1ed3 v\u1eadt x\u00e2y d\u1ef1ng l\u00e0m n\u1ec1n cho c\u0103n nh\u00e0 \u0111\u00f3 <strong>tr\u01b0\u1edbc<\/strong>.<\/p>\n\n\n<p>Xi m\u0103ng, c\u00e1t s\u1ecfi, s\u1eaft th\u00e9p, g\u1ea1ch, b\u1ea3n thi\u1ebft k\u1ebf ch\u00ednh l\u00e0 nh\u1eefng c\u00e1i c\u1ea7n ph\u1ea3i &#8216;pre\/l\u00e0m tr\u01b0\u1edbc&#8217;.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lam_sao_biet_duoc_tai_nguyen_nao_thi_nen_%E2%80%98pre_va_dung_thuoc_tinh_cu_the_nao_voi_tai_nguyen_do\"><\/span>L\u00e0m sao bi\u1ebft \u0111\u01b0\u1ee3c t\u00e0i nguy\u00ean n\u00e0o th\u00ec n\u00ean &#8216;pre&#8217; v\u00e0 d\u00f9ng thu\u1ed9c t\u00ednh c\u1ee5 th\u1ec3 n\u00e0o v\u1edbi t\u00e0i nguy\u00ean \u0111\u00f3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>T\u00e0i nguy\u00ean b\u1ea1n n\u00ean &#8216;pre&#8217; l\u00e0 t\u00e0i nguy\u00ean quan tr\u1ecdng c\u1ee7a website, l\u00e0m n\u1ec1n t\u1ea3ng cho trang.<\/p>\n\n\n<p><strong>Preconnect<\/strong> hay \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 t\u1ea1o ra c\u00e1c k\u1ebft n\u1ed1i tr\u01b0\u1edbc v\u1edbi c\u00e1c t\u00e0i nguy\u00ean c\u1ee7a b\u00ean th\u1ee9 ba m\u00e0 ch\u01b0a c\u1ea7n ph\u1ea3i t\u1ea3i t\u00e0i nguy\u00ean \u0111\u00f3 ngay t\u1ee9c kh\u1eafc, nh\u01b0ng n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c t\u1ea3i trong kho\u1ea3ng th\u1eddi gian g\u1ea7n (kho\u1ea3ng 10s sau khi ng\u01b0\u1eddi d\u00f9ng \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ebfn trang). K\u1ebft n\u1ed1i tr\u01b0\u1edbc bao g\u1ed3m <a href=\"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u00ecm ki\u1ebfm DNS<\/a> v\u00e0 t\u1ea1o https. V\u00ed d\u1ee5 <a href=\"https:\/\/kiencang.net\/preconnect-youtube\/\" target=\"_blank\" rel=\"noreferrer noopener\">preconnect v\u1edbi YouTube<\/a>, c\u00e1c m\u00e3 ph\u00e2n t\u00edch website, Facebook, v\u00e2n v\u00e2n. Preconnect gi\u1ed1ng nh\u01b0 b\u1ea1n g\u1ecdi \u0111i\u1ec7n \u0111\u1eb7t h\u00e0ng tr\u01b0\u1edbc cho c\u00e1c c\u1eeda h\u00e0ng x\u00e2y d\u1ef1ng \u0111\u1ec3 h\u1ecd chu\u1ea9n b\u1ecb. S\u1ed1 l\u01b0\u1ee3ng h\u00e0ng, lo\u1ea1i h\u00e0ng \u0111\u00e3 \u0111\u01b0\u1ee3c bi\u1ebft tr\u01b0\u1edbc, l\u00fac c\u1ea7n ch\u1ec9 vi\u1ec7c ch\u1edf \u0111\u1ebfn c\u00f4ng tr\u00ecnh \u0111\u1ed3ng lo\u1ea1t thay v\u00ec b\u1ea1n s\u1ebd ph\u1ea3i ch\u1edd t\u1eebng c\u1eeda h\u00e0ng mang v\u1eadt li\u1ec7u \u0111\u1ebfn r\u1ed3i m\u1edbi \u0111\u1eb7t h\u00e0ng \u1edf c\u1eeda h\u00e0ng k\u1ebf ti\u1ebfp- t\u1ee9c b\u1ea1n mua \u1edf c\u1eeda h\u00e0ng A, \u0111\u1ee3i A mang v\u1eadt li\u1ec7u \u0111\u1ebfn r\u1ed3i m\u1edbi \u0111\u1eb7t h\u00e0ng \u1edf c\u1eeda h\u00e0ng B, \u0111\u1ee3i B mang v\u1eadt li\u1ec7u \u0111\u1ebfn, r\u1ed3i m\u1edbi \u0111\u1eb7t \u1edf c\u1eeda h\u00e0ng C, qu\u00e1 tr\u00ecnh c\u1ee9 ti\u1ebfp di\u1ec5n nh\u01b0 v\u1eady&#8230; V\u00ec qu\u00e1 tr\u00ecnh nh\u01b0 th\u1ebf kh\u00f4ng di\u1ec5n ra song song n\u00ean s\u1ebd m\u1ea5t th\u1eddi gian h\u01a1n. Preconnect kh\u00f4ng l\u00e0m gia t\u0103ng g\u00e1nh n\u1eb7ng \u0111\u00e1ng k\u1ec3 l\u00ean m\u00e1y ch\u1ee7 c\u1ee7a b\u1ea1n, tuy nhi\u00ean <a href=\"https:\/\/kiencang.net\/trai-nghiem-link-preconnect\/\" target=\"_blank\" rel=\"noreferrer noopener\">preconnect \u0111\u1ebfn t\u1ea5t c\u1ea3 t\u00e0i nguy\u00ean c\u1ee7a b\u00ean th\u1ee9 ba c\u00f3 th\u1ec3 l\u00e0m website ch\u1eadm hi\u1ec3n th\u1ecb h\u01a1n so v\u1edbi vi\u1ec7c ch\u1ec9 preconnect c\u00f3 ch\u1ecdn l\u1ecdc<\/a>.<\/p>\n\n\n<p><strong>Preload<\/strong> hay \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 t\u1ea3i s\u1eb5n c\u00e1c t\u00e0i nguy\u00ean quan tr\u1ecdng c\u1ee7a ch\u00ednh website, v\u00ed d\u1ee5 nh\u01b0 font, <a href=\"https:\/\/kiencang.net\/critical-css-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">critical CSS<\/a>, file JS thi\u1ebft y\u1ebfu ho\u1eb7c c\u00e1c t\u00e0i nguy\u00ean m\u00e0 b\u1ea1n ch\u1eafc ch\u1eafn ph\u1ea3i t\u1ea3i v\u1ec1 nhanh ch\u00f3ng tr\u00ean trang (t\u00e0i nguy\u00ean \u0111\u00f3 s\u1ebd \u0111\u01b0\u1ee3c d\u00f9ng ngay trong l\u01b0\u1ee3t t\u1ea3i \u0111\u1ea7u ti\u00ean \/ initial page load). Preload = Preconnect + t\u1ea3i t\u00e0i nguy\u00ean v\u1ec1 c\u00e0ng s\u1edbm c\u00e0ng t\u1ed1t. Preload gi\u1ed1ng nh\u01b0 nguy\u00ean v\u1eadt li\u1ec7u l\u00e0m m\u00f3ng cho c\u0103n nh\u00e0 v\u00e0 x\u00e2y t\u1ea7ng m\u1ed9t. Preload kh\u00f4ng l\u00e0m gia t\u0103ng g\u00e1nh n\u1eb7ng l\u00ean m\u00e1y ch\u1ee7 c\u1ee7a b\u1ea1n ho\u1eb7c ch\u00ednh x\u00e1c h\u01a1n th\u00ec ch\u1ec9 r\u1ea5t nh\u1ecf, h\u1ea7u nh\u01b0 kh\u00f4ng \u0111\u00e1ng k\u1ec3, v\u00e0 kho\u1ea3ng th\u1eddi gian t\u00e1c \u0111\u1ed9ng c\u0169ng r\u1ea5t ng\u1eafn. S\u1ef1 gia t\u0103ng nh\u1ecf \u0111\u01b0\u1ee3c b\u00f9 \u0111\u1eafp b\u1eb1ng c\u00e1c l\u1ee3i \u00edch l\u1edbn h\u01a1n m\u00e0 n\u00f3 \u0111em l\u1ea1i.<\/p>\n\n\n<p><strong>Prefetch<\/strong> \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 t\u1ea3i s\u1eb5n c\u00e1c t\u00e0i nguy\u00ean m\u00e0 ng\u01b0\u1eddi d\u00f9ng <em>c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng trong c\u00e1c trang, l\u01b0\u1ee3t truy c\u1eadp ti\u1ebfp theo<\/em>, do v\u1eady so v\u1edbi c\u00e1c t\u00e0i nguy\u00ean \u1edf phi\u00ean l\u00e0m vi\u1ec7c hi\u1ec7n t\u1ea1i m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean c\u1ee7a n\u00f3 th\u1ea5p h\u01a1n, k\u1ec3 c\u1ea3 so v\u1edbi c\u00e1c t\u00e0i nguy\u00ean kh\u00f4ng quan tr\u1ecdng \u1edf phi\u00ean hi\u1ec7n t\u1ea1i. Prefetch gi\u1ed1ng nh\u01b0 nguy\u00ean v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 x\u00e2y t\u1ea7ng hai, t\u1ea7ng ba, t\u1ea7ng b\u1ed1n, hay th\u1eadm ch\u00ed l\u00e0 c\u0103n nh\u00e0 ngh\u1ec9 d\u01b0\u1ee1ng kh\u00e1c \u1edf v\u00f9ng \u0111\u1ea5t n\u00e0o \u0111\u00f3 m\u00e0 ng\u01b0\u1eddi d\u00f9ng <em>v\u1eabn ch\u01b0a quy\u1ebft \u0111\u1ecbnh<\/em>, d\u0129 nhi\u00ean n\u00f3 c\u0169ng quan tr\u1ecdng nh\u01b0ng kh\u00f4ng c\u1ea5p thi\u1ebft b\u1eb1ng nguy\u00ean li\u1ec7u d\u00f9ng \u0111\u1ec3 x\u00e2y t\u1ea7ng m\u1ed9t c\u1ee7a c\u0103n nh\u00e0 hi\u1ec7n t\u1ea1i. \u0110i\u1ec1u quan tr\u1ecdng c\u1ea7n \u0111\u1ec3 \u00fd \u1edf \u0111\u00e2y l\u00e0 c\u00f3 nh\u1eefng nh\u00e0 kh\u00f4ng x\u00e2y t\u1ea7ng hai ho\u1eb7c t\u1ea7ng ba- c\u00f3 nh\u1eefng kh\u00e1ch gh\u00e9 th\u0103m ch\u1ec9 xem duy nh\u1ea5t m\u1ed9t trang, v\u00e0 n\u1ebfu h\u1ecd xem trang k\u1ebf ti\u1ebfp, th\u1eadt kh\u00f3 \u0111\u1ec3 <a href=\"https:\/\/kiencang.net\/du-doan-prefetch\/\" target=\"_blank\" rel=\"noreferrer noopener\">d\u1ef1 \u0111o\u00e1n ch\u00ednh x\u00e1c h\u1ecd mu\u1ed1n xem trang n\u00e0o<\/a>, th\u1ebf n\u00ean prefetch g\u00e2y l\u00e3ng ph\u00ed t\u00e0i nguy\u00ean d\u00f9 \u00edt d\u00f9 nhi\u1ec1u, n\u00f3 ch\u1eafc ch\u1eafn s\u1ebd khi\u1ebfn b\u1ea1n ph\u1ea3i <a href=\"https:\/\/kiencang.net\/mua-hosting-cho-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">s\u1eed d\u1ee5ng hosting t\u1ed1t h\u01a1n g\u00f3i m\u00e0 b\u1ea1n \u0111ang d\u00f9ng<\/a>, c\u00f3 th\u1ec3 y\u00eau c\u1ea7u th\u00f4ng s\u1ed1 cao h\u01a1n g\u1ea5p \u0111\u00f4i, g\u1ea5p ba, t\u00f9y thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9, s\u1ed1 l\u01b0\u1ee3ng c\u00e1c li\u00ean k\u1ebft c\u1ea7n t\u00ecm n\u1ea1p tr\u01b0\u1edbc. Nh\u01b0ng \u0111\u00f3 l\u00e0 <em>c\u00e1i gi\u00e1 c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c tr\u00ean nh\u1eefng trang m\u00e0 l\u01b0\u1ee3t truy c\u1eadp c\u00f3 gi\u00e1 tr\u1ecb cao<\/em>&#8211; v\u00ed d\u1ee5 nh\u01b0 c\u00e1c trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed. Plugin gi\u00fap b\u1ea1n tri\u1ec3n khai prefetch d\u1ec5 d\u00e0ng tr\u00ean WordPress l\u00e0 <a href=\"https:\/\/kiencang.net\/plugin-flying-pages\/\" target=\"_blank\" rel=\"noreferrer noopener\">Flying Pages<\/a>. L\u01b0u \u00fd, khi b\u1ea1n tri\u1ec3n khai prefetch h\u00e3y <a href=\"https:\/\/kiencang.net\/cach-do-toc-do-website\/\" target=\"_blank\" rel=\"noreferrer noopener\">ki\u1ec3m tra t\u1ed1c \u0111\u1ed9 website<\/a> theo c\u00e1ch th\u1ee7 c\u00f4ng th\u1eadt c\u1ea9n th\u1eadn, v\u00ec tr\u00ean m\u1ed9t s\u1ed1 website ngay c\u1ea3 khi \u0111\u01b0\u1ee3c n\u00e2ng c\u1ea5p hosting, prefetch th\u1eadm ch\u00ed c\u00f2n l\u00e0m t\u1ed1c \u0111\u1ed9 ch\u1eadm \u0111i, ho\u1eb7c\/v\u00e0 l\u00fac th\u00ec r\u1ea5t nhanh, l\u00fac th\u00ec ch\u1eadm \u0111\u00e1ng k\u1ec3. <\/p>\n\n\n<p>(<em>M\u1ed9t ph\u1ea7n b\u00e0i vi\u1ebft n\u00e0y \u0111\u01b0\u1ee3c tham kh\u1ea3o t\u1eeb b\u00e0i How to improve web performance By using Preload, Preconnect, Prefetch c\u1ee7a t\u00e1c gi\u1ea3 Sai Gowtham<\/em>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ng\u00e0y h\u00f4m nay t\u00f4i s\u1ebd tr\u00ecnh b\u00e0y m\u1ed9t v\u00e0i k\u1ef9 thu\u1eadt \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 gi\u00fap website c\u1ee7a b\u1ea1n t\u1ea3i nhanh h\u01a1n. \u0110\u1ea7u ti\u00ean, ch\u00fang ta c\u1ea7n bi\u1ebft preload, preconnect v\u00e0 prefetch l\u00e0 g\u00ec \u0111\u00e3. Preload &#8211; Khi ch\u00fang ta s\u1eed d\u1ee5ng preload trong tag link, tr\u00ecnh duy\u1ec7t s\u1ebd ti\u1ebfn h\u00e0nh t\u00ecm n\u1ea1p s\u1edbm y\u00eau c\u1ea7u &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[291],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 website b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng preload, preconnect, prefetch &#8226; Ki\u1ebfn c\u00e0ng<\/title>\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\/preload-preconnect-prefetch\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 website b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng preload, preconnect, prefetch &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Ng\u00e0y h\u00f4m nay t\u00f4i s\u1ebd tr\u00ecnh b\u00e0y m\u1ed9t v\u00e0i k\u1ef9 thu\u1eadt \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 gi\u00fap website c\u1ee7a b\u1ea1n t\u1ea3i nhanh h\u01a1n. \u0110\u1ea7u ti\u00ean, ch\u00fang ta c\u1ea7n bi\u1ebft preload, preconnect v\u00e0 prefetch l\u00e0 g\u00ec \u0111\u00e3. Preload &#8211; Khi ch\u00fang ta s\u1eed d\u1ee5ng preload trong tag link, tr\u00ecnh duy\u1ec7t s\u1ebd ti\u1ebfn h\u00e0nh t\u00ecm n\u1ea1p s\u1edbm y\u00eau c\u1ea7u &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/preload-preconnect-prefetch\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-03-04T15:59:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/hieu-suat-vuejs-2.png\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"C\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 website b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng preload, preconnect, prefetch &#8226; Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/preload-preconnect-prefetch\/","og_locale":"vi_VN","og_type":"article","og_title":"C\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 website b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng preload, preconnect, prefetch &#8226; Ki\u1ebfn c\u00e0ng","og_description":"Ng\u00e0y h\u00f4m nay t\u00f4i s\u1ebd tr\u00ecnh b\u00e0y m\u1ed9t v\u00e0i k\u1ef9 thu\u1eadt \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 gi\u00fap website c\u1ee7a b\u1ea1n t\u1ea3i nhanh h\u01a1n. \u0110\u1ea7u ti\u00ean, ch\u00fang ta c\u1ea7n bi\u1ebft preload, preconnect v\u00e0 prefetch l\u00e0 g\u00ec \u0111\u00e3. 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