{"id":11963,"date":"2021-02-25T10:50:00","date_gmt":"2021-02-25T03:50:00","guid":{"rendered":"https:\/\/www.ducanhplus.com\/?p=11963"},"modified":"2021-02-25T10:50:00","modified_gmt":"2021-02-25T03:50:00","slug":"toi-thieu-thoi-gian-tra-cuu-dns","status":"publish","type":"post","link":"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/","title":{"rendered":"T\u1ed1i thi\u1ec3u h\u00f3a th\u1eddi gian tra c\u1ee9u DNS"},"content":{"rendered":"\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-6577d6e6c3636\" ><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-6577d6e6c3636\"  type=\"checkbox\" id=\"item-6577d6e6c3636\"><\/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\/toi-thieu-thoi-gian-tra-cuu-dns\/#Tra_cuu_DNS_la_gi\" title=\"Tra c\u1ee9u DNS l\u00e0 g\u00ec?\">Tra c\u1ee9u DNS l\u00e0 g\u00ec?<\/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\/toi-thieu-thoi-gian-tra-cuu-dns\/#Biet_duoc_trang_cua_ban_dang_lam_gi_Quyet_dinh_xem_dieu_gi_la_quan_trong_cho_trang_cua_ban\" title=\"Bi\u1ebft \u0111\u01b0\u1ee3c trang c\u1ee7a b\u1ea1n \u0111ang l\u00e0m g\u00ec. Quy\u1ebft \u0111\u1ecbnh xem \u0111i\u1ec1u g\u00ec l\u00e0 quan tr\u1ecdng cho trang c\u1ee7a b\u1ea1n?\">Bi\u1ebft \u0111\u01b0\u1ee3c trang c\u1ee7a b\u1ea1n \u0111ang l\u00e0m g\u00ec. Quy\u1ebft \u0111\u1ecbnh xem \u0111i\u1ec1u g\u00ec l\u00e0 quan tr\u1ecdng cho trang c\u1ee7a b\u1ea1n?<\/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\/toi-thieu-thoi-gian-tra-cuu-dns\/#Lam_the_nao_de_biet_duoc_tra_cuu_DNS_xay_ra_tren_trang_cua_toi_nhu_the_nao\" title=\"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c tra c\u1ee9u DNS x\u1ea3y ra tr\u00ean trang c\u1ee7a t\u00f4i nh\u01b0 th\u1ebf n\u00e0o?\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c tra c\u1ee9u DNS x\u1ea3y ra tr\u00ean trang c\u1ee7a t\u00f4i 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-4\" href=\"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/#Lam_the_nao_cai_thien_duoc_thoi_gian_tra_cuu_DNS_de_no_nhanh_hon\" title=\"L\u00e0m th\u1ebf n\u00e0o c\u1ea3i thi\u1ec7n \u0111\u01b0\u1ee3c th\u1eddi gian tra c\u1ee9u DNS \u0111\u1ec3 n\u00f3 nhanh h\u01a1n\">L\u00e0m th\u1ebf n\u00e0o c\u1ea3i thi\u1ec7n \u0111\u01b0\u1ee3c th\u1eddi gian tra c\u1ee9u DNS \u0111\u1ec3 n\u00f3 nhanh h\u01a1n<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tra_cuu_DNS_la_gi\"><\/span>Tra c\u1ee9u DNS l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<ul><li><a href=\"https:\/\/kiencang.net\/dns-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">DNS l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a c\u1ee5m t\u1eeb &#8220;Domain Name System<\/a>\/H\u1ec7 th\u1ed1ng Ph\u00e2n gi\u1ea3i T\u00ean mi\u1ec1n&#8221;;<\/li><li>M\u1ed9t t\u00ean mi\u1ec1n nh\u01b0 &#8220;<code>ten-mien-cua-ban.com<\/code>&#8221; ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t \u0111\u1ecba ch\u1ec9 IP n\u00e0o \u0111\u00f3;<\/li><li>Tra c\u1ee9u DNS (DNS lookup) l\u00e0 m\u1ed9t y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c g\u1eedi t\u1edbi m\u00e1y ch\u1ee7 kh\u00e1c \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c c\u00e2u tr\u1ea3 l\u1eddi v\u1ec1 \u0111\u1ecba ch\u1ec9 IP cho m\u1ed9t t\u00ean mi\u1ec1n c\u1ee5 th\u1ec3<\/li><\/ul>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/tra-cuu-DNS.png\" alt=\"tra c\u1ee9u DNS\" class=\"wp-image-11978\"\/><\/figure><\/div>\n\n\n<p>V\u1edbi b\u1ea5t k\u1ef3 t\u00e0i nguy\u00ean n\u00e0o b\u1ea1n mu\u1ed1n t\u1ea3i cho trang, tr\u00ecnh duy\u1ec7t s\u1ebd ph\u1ea3i &#8220;t\u00ecm ki\u1ebfm n\u00f3&#8221;. Tr\u00ecnh duy\u1ec7t c\u1ea7n l\u00e0m \u0111i\u1ec1u \u0111\u00f3 \u00edt nh\u1ea5t m\u1ed9t l\u1ea7n cho m\u1ed7i t\u00ean mi\u1ec1n m\u00e0 trang web c\u1ee7a b\u1ea1n ch\u1ee9a t\u00e0i nguy\u00ean.<\/p>\n\n\n<p>C\u00e1c trang web ng\u00e0y c\u00e0ng \u0111a d\u1ea1ng t\u00ednh n\u0103ng, v\u00e0 n\u00f3 th\u01b0\u1eddng s\u1eed d\u1ee5ng nhi\u1ec1u tra c\u1ee9u DNS &#8211; c\u00e1i khi\u1ebfn cho vi\u1ec7c <a href=\"https:\/\/kiencang.net\/cach-trang-web-tai-va-hien-thi\/\" target=\"_blank\" rel=\"noreferrer noopener\">render \/ hi\u1ec3n th\u1ecb trang<\/a> b\u1ecb ch\u1eadm \u0111i nhi\u1ec1u.<\/p>\n\n\n<p>Qu\u00e1 tr\u00ecnh n\u00e0y c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm trang web c\u1ee7a b\u1ea1n \u0111\u00e1ng k\u1ec3, v\u00e0 m\u1ed9t trong nh\u1eefng quy\u1ebft \u0111\u1ecbnh m\u00e0 b\u1ea1n c\u1ea7n th\u1ef1c hi\u1ec7n \u0111\u1ec3 <a href=\"https:\/\/kiencang.net\/tang-toc-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 trang web<\/a> l\u00e0 \u0111\u00e1nh gi\u00e1 xem hi\u1ec7n trang c\u1ee7a b\u1ea1n c\u00f3 \u0111ang c\u00f3 qu\u00e1 nhi\u1ec1u tra c\u1ee9u DNS hay kh\u00f4ng.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/doi-cho-dns.png\" alt=\"tra c\u1ee9u DNS qu\u00e1 nhi\u1ec1u khi\u1ebfn t\u1ed1n th\u1eddi gian render\" class=\"wp-image-11979\"\/><\/figure><\/div>\n\n\n<p>Trang web nh\u1ecf \u0111\u00e1ng l\u1ebd c\u00f3 th\u1ec3 ch\u1ec9 c\u1ea7n t\u1ea3i trong m\u1ed9t gi\u00e2y, c\u00f3 khi ph\u1ea3i m\u1ea5t nhi\u1ec1u gi\u00e2y \u0111\u1ec3 t\u1ea3i v\u1ec1, ch\u1ec9 b\u1edfi n\u00f3 t\u1ed1n th\u1eddi gian tra c\u1ee9u DNS. N\u1ebfu b\u1ea1n c\u00f3 tr\u1ea3i nghi\u1ec7m ch\u1eadm v\u1ec1 t\u1ed1c \u0111\u1ed9 t\u1ea3i trang, h\u00e3y th\u1eed ki\u1ec3m tra c\u00f3 bao nhi\u00eau t\u00ecm ki\u1ebfm\/tra c\u1ee9u DNS tr\u00ean trang c\u1ee7a b\u1ea1n v\u00e0 quy\u1ebft \u0111\u1ecbnh xem c\u00f3 n\u00ean ti\u1ebfp t\u1ee5c s\u1eed d\u1ee5ng n\u00f3 hay kh\u00f4ng. Th\u1eddi gian t\u1ed1n th\u00eam l\u00e0m ch\u1eadm vi\u1ec7c t\u1ea3i trang do <a href=\"https:\/\/kiencang.net\/tai-nguyen-ben-thu-ba-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e1c ngu\u1ed3n c\u1ee7a b\u00ean th\u1ee9 ba<\/a> \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi t\u00ean g\u1ecdi: <em>\u0111\u1ed9 tr\u1ec5 do tra c\u1ee9u DNS<\/em> (DNS lookup time).<\/p>\n\n\n<p>M\u1ed9t v\u00ed d\u1ee5 v\u1ec1 \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0 n\u00fat m\u1ea1ng x\u00e3 h\u1ed9i (facebook \/ twitter \/ google +) nh\u1eefng n\u00fat m\u1ea1ng x\u00e3 h\u1ed9i n\u00e0y c\u00f3 kh\u1ea3 n\u0103ng y\u00eau c\u1ea7u nhi\u1ec1u h\u01a1n m\u1ed9t ngu\u1ed3n &#8211; c\u00e1i m\u00e0 nhi\u1ec1u khi b\u1ea1n kh\u00f4ng t\u00ednh tr\u01b0\u1edbc \u0111\u01b0\u1ee3c l\u00e0 s\u1ebd nh\u01b0 v\u1eady. Nhi\u1ec1u t\u00ednh n\u0103ng hi\u1ec7n \u0111\u1ea1i tr\u00ean trang y\u00eau c\u1ea7u t\u00e0i nguy\u00ean r\u1ea5t n\u1eb7ng, v\u00e0 ph\u1ea3i g\u1ecdi c\u00e1c t\u00ean mi\u1ec1n kh\u00e1c nhau cho c\u00f4ng vi\u1ec7c \u0111\u00f3. M\u1ed9t v\u00ed d\u1ee5 kh\u00e1c l\u00e0 Google webfonts, n\u00f3 c\u1ea7n \u0111\u1ebfn hai y\u00eau c\u1ea7u tra c\u1ee9u DNS. (Xem th\u00eam v\u1ec1 vi\u1ec7c <a href=\"https:\/\/kiencang.net\/font-cho-web-va-toc-do-tai-trang\/\" target=\"_blank\" rel=\"noreferrer noopener\">s\u1eed d\u1ee5ng font tr\u00ean web \u1ea3nh h\u01b0\u1edfng th\u1ebf n\u00e0o \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 \u1edf \u0111\u00e2y<\/a>).<\/p>\n\n\n<p>M\u1ed9t quy\u1ebft \u0111\u1ecbnh kh\u00f4ng t\u1ed3i l\u00e0 c\u1ea7n bi\u1ebft xem hi\u1ec7n trang c\u1ee7a b\u1ea1n \u0111ang y\u00eau c\u1ea7u nh\u1eefng g\u00ec, qua \u0111\u00f3 b\u1ea1n c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o \u0111\u01b0\u1ee3c trang t\u1ea3i nhanh ch\u00f3ng h\u01a1n cho ng\u01b0\u1eddi d\u00f9ng. C\u00f4ng c\u1ee5 m\u00e0 t\u00f4i mu\u1ed1n chia s\u1ebb l\u00e0 \u0111\u00e2y: <a href=\"https:\/\/kiencang.net\/huong-dan-su-dung-pingdom\/\" target=\"_blank\" rel=\"noreferrer noopener\">Pingdom<\/a>, n\u00f3 s\u1ebd gi\u00fap b\u1ea1n bi\u1ebft \u0111\u01b0\u1ee3c c\u00f3 bao nhi\u00eau y\u00eau c\u1ea7u m\u00e0 trang c\u1ee7a b\u1ea1n t\u1ea1o ra.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Biet_duoc_trang_cua_ban_dang_lam_gi_Quyet_dinh_xem_dieu_gi_la_quan_trong_cho_trang_cua_ban\"><\/span>Bi\u1ebft \u0111\u01b0\u1ee3c trang c\u1ee7a b\u1ea1n \u0111ang l\u00e0m g\u00ec. Quy\u1ebft \u0111\u1ecbnh xem \u0111i\u1ec1u g\u00ec l\u00e0 quan tr\u1ecdng cho trang c\u1ee7a b\u1ea1n?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Li\u1ec7u webfont n\u00e0y c\u00f3 \u0111\u00e1ng \u0111\u1ec3 b\u1ea1n b\u1ecf ra 1 \u0111\u1ebfn 2 gi\u00e2y t\u1ea3i v\u1ec1 kh\u00f4ng? \u0110\u00f4i khi n\u00f3 \u0111\u00e1ng, nh\u01b0ng \u0111\u00f4i khi n\u00f3 c\u0169ng kh\u00f4ng c\u1ea7n thi\u1ebft ph\u1ea3i v\u1eady. Li\u1ec7u <a href=\"https:\/\/kiencang.net\/vi-tri-nut-mang-xa-hoi\/\" target=\"_blank\" rel=\"noreferrer noopener\">n\u00fat chia s\u1ebb m\u1ea1ng x\u00e3 h\u1ed9i<\/a> quan tr\u1ecdng h\u01a1n t\u1ed1c \u0111\u1ed9 trang? \u0110i\u1ec1u \u0111\u00f3 c\u00f2n t\u00f9y v\u00e0o t\u1eebng trang web.<\/p>\n\n\n<p>T\u1ea1o ra s\u1ef1 c\u00e2n b\u1eb1ng t\u1ed1t gi\u1eefa t\u1ed1c \u0111\u1ed9 t\u1ea3i trang web v\u00e0 tra c\u1ee9u DNS ch\u1ee7 y\u1ebfu l\u00e0 v\u1ea5n \u0111\u1ec1 quy\u1ebft \u0111\u1ecbnh xem \u0111i\u1ec1u g\u00ec l\u00e0 quan tr\u1ecdng v\u1edbi trang web c\u1ee7a b\u1ea1n.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lam_the_nao_de_biet_duoc_tra_cuu_DNS_xay_ra_tren_trang_cua_toi_nhu_the_nao\"><\/span>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c tra c\u1ee9u DNS x\u1ea3y ra tr\u00ean trang c\u1ee7a t\u00f4i nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean c\u1ea7n ph\u1ea3i bi\u1ebft l\u00e0 n\u1eafm r\u00f5 trang c\u1ee7a b\u1ea1n \u0111ang y\u00eau c\u1ea7u nh\u1eefng g\u00ec (c\u00e1c ngu\u1ed3n t\u00e0i nguy\u00ean n\u00e0o n\u00f3 c\u1ea7n \u0111\u1ec3 t\u1ea3i trang). C\u00f4ng c\u1ee5 Pingdom v\u1eeba n\u00f3i \u1edf tr\u00ean s\u1ebd gi\u00fap b\u1ea1n xem c\u00f3 bao nhi\u00eau y\u00eau c\u1ea7u m\u00e0 trang c\u1ea7n t\u1ea3i. T\u1eebng t\u00ean mi\u1ec1n kh\u00e1c nhau d\u00f9ng \u0111\u1ec3 t\u1ea3i v\u1ec1 t\u00e0i nguy\u00ean s\u1ebd y\u00eau c\u1ea7u \u00edt nh\u1ea5t l\u00e0 m\u1ed9t l\u1ea7n tra c\u1ee9u DNS.<\/p>\n\n\n<p>V\u00ed d\u1ee5: N\u1ebfu b\u1ea1n s\u1eed d\u1ee5ng JavaScript t\u1eeb Twitter cho n\u00fat b\u1ea5m Twitter, th\u1ebf th\u00ec tra c\u1ee9u DNS s\u1ebd c\u1ea7n ph\u1ea3i c\u00f3 cho t\u00ean mi\u1ec1n <code>twitter.com<\/code> v\u00e0 n\u1ebfu b\u1ea1n c\u0169ng s\u1eed d\u1ee5ng c\u1ea3 Facebook n\u1eefa, th\u1ebf th\u00ec s\u1ebd c\u00f3 th\u00eam m\u1ed9t t\u00ean mi\u1ec1n, v\u00e0 t\u01b0\u01a1ng \u1ee9ng l\u00e0 m\u1ed9t l\u1ea7n tra c\u1ee9u DNS t\u0103ng th\u00eam.<\/p>\n\n\n<p>B\u1ea1n h\u00e3y v\u00e0o trang <a href=\"https:\/\/www.webpagetest.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">webpagetest.org<\/a> v\u00e0 ki\u1ec3m tra trang c\u1ee7a b\u1ea1n \u1edf \u0111\u00f3. N\u00f3 s\u1ebd cho th\u1ea5y c\u00f3 bao nhi\u00eau y\u00eau c\u1ea7u m\u00e0 trang c\u1ee7a b\u1ea1n t\u1ea1o ra. H\u00e3y xem c\u1ea9n th\u1eadn k\u1ebft qu\u1ea3 v\u00e0 \u0111\u1ebfm s\u1ed1 l\u1ea7n tra c\u1ee9u DNS.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lam_the_nao_cai_thien_duoc_thoi_gian_tra_cuu_DNS_de_no_nhanh_hon\"><\/span>L\u00e0m th\u1ebf n\u00e0o c\u1ea3i thi\u1ec7n \u0111\u01b0\u1ee3c th\u1eddi gian tra c\u1ee9u DNS \u0111\u1ec3 n\u00f3 nhanh h\u01a1n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>T\u1ed1c \u0111\u1ed9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n b\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf ho\u1eb7c tr\u00ec ho\u00e3n l\u1eddi g\u1ecdi DNS.<\/p>\n\n\n<p>Th\u1eadm ch\u1ec9 n\u1ebfu b\u1ea1n kh\u00f4ng th\u1ec3 lo\u1ea1i b\u1ecf nh\u1eefng th\u1ee9 tr\u00ean trang m\u00e0 \u0111ang th\u1ef1c hi\u1ec7n c\u00e1c l\u1eddi g\u1ecdi DNS, b\u1ea1n v\u1eabn c\u00f3 th\u1ec3 c\u1ea7n c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 c\u1ee7a trang b\u1eb1ng c\u00e1ch kh\u00f4ng t\u1ea3i ch\u00fang ngay l\u1eadp t\u1ee9c.<\/p>\n\n\n<p>\u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng c\u00e1ch <a href=\"https:\/\/kiencang.net\/tri-hoan-tai-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">tr\u00ec ho\u00e0n t\u1ea3i JavaScript<\/a>, JS th\u01b0\u1eddng kh\u00f4ng c\u1ea7n thi\u1ebft cho <a href=\"https:\/\/kiencang.net\/uu-tien-noi-dung-hien-thi\/\" target=\"_blank\" rel=\"noreferrer noopener\">n\u1ed9i dung n\u1eb1m trong m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean<\/a>.<\/p>\n\n\n<p>\u0110\u1ec3 bi\u1ebft c\u00e1ch \u01b0u ti\u00ean t\u1ea3i n\u1ed9i dung trong m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean tr\u01b0\u1edbc, h\u00e3y t\u00ecm hi\u1ec3u <a href=\"https:\/\/kiencang.net\/duong-dan-hien-thi-trang-quan-trong\/\" target=\"_blank\" rel=\"noreferrer noopener\">tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng<\/a> (critical rendering path). Ch\u00fac b\u1ea1n s\u1edbm c\u00f3 t\u1ed1c \u0111\u1ed9 website l\u01b0\u1edbt nhanh nh\u01b0 Speed.Family!<\/p>\n\n\n<p>P\/S (c\u1ee7a ng\u01b0\u1eddi d\u1ecbch):<\/p>\n\n\n<ul><li>B\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng <a href=\"https:\/\/kiencang.net\/preload-prefetch-preconnect\/#Prefetch\" target=\"_blank\" rel=\"noreferrer noopener\">dns-prefetch<\/a> ho\u1eb7c <a href=\"https:\/\/kiencang.net\/su-dung-preconnect\/\" target=\"_blank\" rel=\"noreferrer noopener\">preconnect<\/a> \u0111\u1ec3 t\u1ed1i thi\u1ec3u h\u00f3a th\u1eddi gian tra c\u1ee9u DNS c\u1ee7a nhi\u1ec1u t\u00e0i nguy\u00ean b\u00ean ngo\u00e0i. N\u00f3 gi\u1ea3m th\u1eddi gian b\u1eb1ng c\u00e1ch th\u1ef1c hi\u1ec7n c\u00e1c tra c\u1ee9u DNS song song nhau.<\/li><li>M\u1ed9t m\u1eb9o n\u1eefa \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n l\u00e0 s\u1eed d\u1ee5ng DNS c\u00f3 t\u1ed1c \u0111\u1ed9 cao. \u0110i\u1ec1u n\u00e0y hi\u1ec7n ch\u1ec9 \u00e1p d\u1ee5ng ri\u00eang cho t\u00ean mi\u1ec1n c\u1ee7a b\u1ea1n m\u00e0 th\u00f4i, kh\u00f4ng s\u1eed d\u1ee5ng \u0111\u01b0\u1ee3c cho b\u00ean th\u1ee9 ba. Theo th\u1ed1ng k\u00ea hi\u1ec7n t\u1ea1i th\u00ec <a href=\"https:\/\/kiencang.net\/gioi-thieu-dich-vu-dns-cua-cloudflare\/\" target=\"_blank\" rel=\"noreferrer noopener\">DNS c\u1ee7a Cloudflare<\/a> \u0111ang c\u00f3 t\u1ed1c \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao nh\u1ea5t th\u1ebf gi\u1edbi, v\u00e0 nhi\u1ec1u t\u00ean mi\u1ec1n c\u1ee7a t\u00f4i \u0111ang d\u00f9ng d\u1ecbch v\u1ee5 mi\u1ec5n ph\u00ed \u1edf \u0111\u00e2y. Ch\u00fa \u00fd l\u00e0 b\u1ea1n ch\u1ec9 d\u00f9ng DNS c\u1ee7a h\u1ecd, trong ph\u1ea7n l\u1edbn tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng c\u1ea7n d\u00f9ng CDN mi\u1ec5n ph\u00ed c\u1ee7a CloudFlare, nh\u1ea5t l\u00e0 v\u1edbi c\u00e1c website quan tr\u1ecdng. Ri\u00eang <a href=\"https:\/\/kiencang.net\/huong-dan-su-dung-cloudflare\/\" target=\"_blank\" rel=\"noreferrer noopener\">g\u00f3i Pro (tr\u1ea3 ph\u00ed)<\/a> c\u1ee7a h\u1ecd th\u00ec kh\u00e1 \u1ed5n. B\u1ea1n c\u00f3 th\u1ec3 c\u00e2n nh\u1eafc d\u00f9ng.<\/li><\/ul>\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft: Minimize DNS lookups \u2013 T\u00e1c gi\u1ea3: Patrick Sexton \u2013 Website: Varvy)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tra c\u1ee9u DNS l\u00e0 g\u00ec? DNS l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a c\u1ee5m t\u1eeb &#8220;Domain Name System\/H\u1ec7 th\u1ed1ng Ph\u00e2n gi\u1ea3i T\u00ean mi\u1ec1n&#8221;; M\u1ed9t t\u00ean mi\u1ec1n nh\u01b0 &#8220;ten-mien-cua-ban.com&#8221; ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t \u0111\u1ecba ch\u1ec9 IP n\u00e0o \u0111\u00f3; Tra c\u1ee9u DNS (DNS lookup) l\u00e0 m\u1ed9t y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c g\u1eedi t\u1edbi m\u00e1y ch\u1ee7 kh\u00e1c \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c c\u00e2u &hellip;<\/p>\n","protected":false},"author":1,"featured_media":13034,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[265],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>T\u1ed1i thi\u1ec3u h\u00f3a th\u1eddi gian tra c\u1ee9u DNS &#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\/toi-thieu-thoi-gian-tra-cuu-dns\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"T\u1ed1i thi\u1ec3u h\u00f3a th\u1eddi gian tra c\u1ee9u DNS &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Tra c\u1ee9u DNS l\u00e0 g\u00ec? DNS l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a c\u1ee5m t\u1eeb &#8220;Domain Name System\/H\u1ec7 th\u1ed1ng Ph\u00e2n gi\u1ea3i T\u00ean mi\u1ec1n&#8221;; M\u1ed9t t\u00ean mi\u1ec1n nh\u01b0 &#8220;ten-mien-cua-ban.com&#8221; ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t \u0111\u1ecba ch\u1ec9 IP n\u00e0o \u0111\u00f3; Tra c\u1ee9u DNS (DNS lookup) l\u00e0 m\u1ed9t y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c g\u1eedi t\u1edbi m\u00e1y ch\u1ee7 kh\u00e1c \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c c\u00e2u &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/\" \/>\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=\"2021-02-25T03:50:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/do-tre-do-tra-cuu-dns.png\" \/>\n\t<meta property=\"og:image:width\" content=\"779\" \/>\n\t<meta property=\"og:image:height\" content=\"409\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/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=\"5 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"T\u1ed1i thi\u1ec3u h\u00f3a th\u1eddi gian tra c\u1ee9u DNS &#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\/toi-thieu-thoi-gian-tra-cuu-dns\/","og_locale":"vi_VN","og_type":"article","og_title":"T\u1ed1i thi\u1ec3u h\u00f3a th\u1eddi gian tra c\u1ee9u DNS &#8226; Ki\u1ebfn c\u00e0ng","og_description":"Tra c\u1ee9u DNS l\u00e0 g\u00ec? DNS l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a c\u1ee5m t\u1eeb &#8220;Domain Name System\/H\u1ec7 th\u1ed1ng Ph\u00e2n gi\u1ea3i T\u00ean mi\u1ec1n&#8221;; M\u1ed9t t\u00ean mi\u1ec1n nh\u01b0 &#8220;ten-mien-cua-ban.com&#8221; ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t \u0111\u1ecba ch\u1ec9 IP n\u00e0o \u0111\u00f3; Tra c\u1ee9u DNS (DNS lookup) l\u00e0 m\u1ed9t y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c g\u1eedi t\u1edbi m\u00e1y ch\u1ee7 kh\u00e1c \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c c\u00e2u &hellip;","og_url":"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/","og_site_name":"Ki\u1ebfn c\u00e0ng","article_author":"https:\/\/www.facebook.com\/anhducnguyen87\/","article_published_time":"2021-02-25T03:50:00+00:00","og_image":[{"width":779,"height":409,"url":"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/do-tre-do-tra-cuu-dns.png","type":"image\/png"}],"author":"Nguy\u1ec5n \u0110\u1ee9c Anh","twitter_card":"summary_large_image","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":"Nguy\u1ec5n \u0110\u1ee9c Anh","\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"5 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/","url":"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/","name":"T\u1ed1i thi\u1ec3u h\u00f3a th\u1eddi gian tra c\u1ee9u DNS &#8226; Ki\u1ebfn c\u00e0ng","isPartOf":{"@id":"https:\/\/kiencang.net\/#website"},"datePublished":"2021-02-25T03:50:00+00:00","dateModified":"2021-02-25T03:50:00+00:00","author":{"@id":"https:\/\/kiencang.net\/#\/schema\/person\/5e7e1a04d8d1218ad8c421ba43d25c16"},"breadcrumb":{"@id":"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/#breadcrumb"},"inLanguage":"vi","potentialAction":[{"@type":"ReadAction","target":["https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/kiencang.net\/"},{"@type":"ListItem","position":2,"name":"T\u1ed1i thi\u1ec3u h\u00f3a th\u1eddi gian tra c\u1ee9u DNS"}]},{"@type":"WebSite","@id":"https:\/\/kiencang.net\/#website","url":"https:\/\/kiencang.net\/","name":"Ki\u1ebfn c\u00e0ng","description":"\u00d4m l\u00fd thuy\u1ebft, h\u00f4n th\u1ef1c h\u00e0nh","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/kiencang.net\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"vi"},{"@type":"Person","@id":"https:\/\/kiencang.net\/#\/schema\/person\/5e7e1a04d8d1218ad8c421ba43d25c16","name":"Nguy\u1ec5n \u0110\u1ee9c Anh","image":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/kiencang.net\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/6d71f9b89393952a8382e30dad26c1ec?s=96&d=monsterid&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/6d71f9b89393952a8382e30dad26c1ec?s=96&d=monsterid&r=g","caption":"Nguy\u1ec5n \u0110\u1ee9c Anh"},"description":"Sinh n\u0103m 1987, t\u1ed1t nghi\u1ec7p Cao \u0111\u1eb3ng th\u1ef1c h\u00e0nh FPT qu\u00e3ng 2014, chuy\u00ean ng\u00e0nh Thi\u1ebft k\u1ebf website. T\u00f4i th\u00edch Content, SEO, Ads, T\u0103ng t\u1ed1c website v\u00e0 Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed. B\u00ean c\u1ea1nh b\u00e0i t\u1ef1 vi\u1ebft, t\u00f4i c\u0169ng d\u1ecbch nhi\u1ec1u n\u1ed9i dung th\u00fa v\u1ecb c\u1ee7a c\u00e1c t\u00e1c gi\u1ea3 kh\u00e1c nhau. FB c\u00e1 nh\u00e2n: facebook.com\/anhducnguyen87. 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