{"id":830,"date":"2018-08-03T07:00:42","date_gmt":"2018-08-03T12:00:42","guid":{"rendered":"https:\/\/www.linuxcloudvps.com\/blog\/?p=830"},"modified":"2018-07-26T08:45:56","modified_gmt":"2018-07-26T13:45:56","slug":"how-to-fix-parallelize-downloads-across-hostnames","status":"publish","type":"post","link":"https:\/\/www.linuxcloudvps.com\/blog\/how-to-fix-parallelize-downloads-across-hostnames\/","title":{"rendered":"How to Fix &#8220;Parallelize Downloads Across Hostnames&#8221; Warning"},"content":{"rendered":"<p>When testing a website for performance using popular online tools like GTMetrix, Pingdom, Google PageSpeed, sometime we might get \u201cParallelize Downloads Across Hostnames\u201d warning.\u00a0 This warning means that your website&#8217;s assets are delivered from the same host name, and it would slower the site&#8217;s speed.<\/p>\n<p>There is a limitation on the number of concurrent connection that web browsers will make to a host. For HTTP\/1 and HTTP\/1.1 connections, a web browser is only able to download one file at a time.<\/p>\n<p><!--more--><\/p>\n<p>When there are many assets (images, javascript, CSS, etc) to be downloaded, the web browser will make many connections to the server to finish downloading the assets.<\/p>\n<p>The time spent waiting for a connection to finish is referred to as blocking. Reducing this blocking time can result in a faster loading page. For example, In HTTP\/1.1, when you open a website, your web browser requests for an image file, and make another requests once it receive a response from the server. It&#8217;s a synchronous connection, once you send a request you&#8217;re stuck until you get a response.<\/p>\n<h2>How to Fix Parallelize Downloads Across Hostnames warning<\/h2>\n<p>Actually, this has been deprecated since 2015, when HTTP\/2 was introduced. The issue in latency that is caused by assets download queue has been solved by multiplexing in HTTP\/2. Multiplexing means the web browser can send multiple requests and receive multiple responses in a single connection, not in a multiple connections as in HTTP\/1.1<\/p>\n<p>To fix this warning, you have several options:<\/p>\n<h3>Upgrade to HTTP\/2<\/h3>\n<p>This is the easiest way to solve the Fix Parallelize Downloads Across Hostnames warning when making some tests for your site&#8217;s speed. In order to use HTTP\/2, you will also need to implement HTTPS. Don&#8217;t worry, HTTPS in HTTP\/2 is much faster if compared with HTTPS in HTTP\/1.1. If you are using<\/p>\n<h3>Use CDN<\/h3>\n<p>Almost all CDN providers are now using HTTP\/2, so you don&#8217;t need to do anything if you are using CDN to serve your static files.<\/p>\n<h3>Use domain sharding<\/h3>\n<p>This is an old method, if you are still using HTTP\/1.1, you can follow the steps below to fix the &#8220;Parallelize Downloads Across Hostnames&#8221; warning. The following steps are for WordPress based websites.<\/p>\n<h4>Add CNAME<\/h4>\n<p>Add 3 (three) CNAME records to your DNS entry, like:<\/p>\n<p>static1.yourdomain.com<br \/>\nstatic2.yourdomain.com<br \/>\nstatic3.yourdomain.com<\/p>\n<h4>Create VHOST file<\/h4>\n<p>&lt;VirtualHost *:80&gt;<br \/>\nServerAdmin webmaster@yourdomain.com<br \/>\nDocumentRoot &#8220;\/var\/www\/html\/yourdomain.com\/wp-content&#8221;<br \/>\nServerName static1.yourdomain.com<br \/>\nServerAlias static2.yourdomain.com static3.yourdomain.com<br \/>\nErrorLog &#8220;\/var\/log\/httpd\/yourdomain.com-error_log&#8221;<br \/>\nCustomLog &#8220;\/var\/log\/httpd\/yourdomain.com-access_log&#8221; combined<\/p>\n<p>&lt;Directory &#8220;\/var\/www\/html\/yourdomain.com\/wp-content&#8221;&gt;<br \/>\nOptions -Indexes<br \/>\nRequire all granted<br \/>\n&lt;\/Directory&gt;<br \/>\n&lt;\/VirtualHost&gt;<\/p>\n<h4>Edit functions.php<\/h4>\n<p>Go to your website dashboard \u2013 Appearance \u2013 Editor \u2013 Select Theme Functions (functions.php). It\u2019s always a good idea to take backup of your functions.php before doing modifications. You can then paste the following code anywhere in your functions.php, but please add it after &lt;?php in the first line, to make it easier to remember the modification you made.<br \/>\n<code><br \/>\nfunction parallelize_hostnames($url, $id) {<br \/>\n$hostname = par_get_hostname($url);<br \/>\n$url = str_replace(parse_url(get_bloginfo('url'), PHP_URL_HOST), $hostname, $url);<br \/>\nreturn $url;<br \/>\n}<br \/>\nfunction par_get_hostname($name) {<br \/>\n$subdomains = array('static1.yourdomain.com','static2.yourdomain.com');<br \/>\n$host = abs(crc32(basename($name)) % count($subdomains));<br \/>\n$hostname = $subdomains[$host];<br \/>\nreturn $hostname;<br \/>\n}<br \/>\nadd_filter('wp_get_attachment_url', 'parallelize_hostnames', 10, 2);<\/code><\/p>\n<hr \/>\n<p>Of course you don\u2019t have to Fix Parallelize Downloads Across Hostnames warning yourself, if you use one of our <a href=\"https:\/\/www.linuxcloudvps.com\/cloud-vps.html\">Cloud VPS hosting<\/a>, in which case you can simply ask our expert Linux admins to Fix Parallelize Downloads Across Hostnames warning, on your websites. They are available 24\u00d77 and will take care of your request immediately.<\/p>\n<p><span style=\"color: #ff0000;\"><strong>PS<\/strong><\/span>. If you liked this post, on how to Fix Parallelize Downloads Across Hostnames warning, please share it with your friends on the social networks using the buttons below or simply leave a comment. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When testing a website for performance using popular online tools like GTMetrix, Pingdom, Google PageSpeed, sometime we might get \u201cParallelize Downloads Across Hostnames\u201d warning.\u00a0 This warning means that your website&#8217;s assets are delivered from the same host name, and it would slower the site&#8217;s speed. There is a limitation on the number of concurrent connection &#8230; <a title=\"How to Fix &#8220;Parallelize Downloads Across Hostnames&#8221; Warning\" class=\"read-more\" href=\"https:\/\/www.linuxcloudvps.com\/blog\/how-to-fix-parallelize-downloads-across-hostnames\/\" aria-label=\"More on How to Fix &#8220;Parallelize Downloads Across Hostnames&#8221; Warning\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":831,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[156,37],"class_list":["post-830","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-parallelize-downloads-across-hostnames","tag-wordpress"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix &quot;Parallelize Downloads Across Hostnames&quot; Warning | LinuxCloudVPS Blog<\/title>\n<meta name=\"description\" content=\"When testing a website for performance using popular online tools like GTMetrix, Pingdom, Google PageSpeed, sometime we might get \u201cParallelize Downloads\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.linuxcloudvps.com\/blog\/how-to-fix-parallelize-downloads-across-hostnames\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Fix &quot;Parallelize Downloads Across Hostnames&quot; Warning | LinuxCloudVPS Blog\" \/>\n<meta property=\"og:description\" content=\"When testing a website for performance using popular online tools like GTMetrix, Pingdom, Google PageSpeed, sometime we might get \u201cParallelize Downloads\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.linuxcloudvps.com\/blog\/how-to-fix-parallelize-downloads-across-hostnames\/\" \/>\n<meta property=\"og:site_name\" content=\"LinuxCloudVPS Blog\" \/>\n<meta property=\"article:publisher\" content=\"http:\/\/www.facebook.com\/LinuxCloudVPS\" \/>\n<meta property=\"article:published_time\" content=\"2018-08-03T12:00:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.linuxcloudvps.com\/blog\/wp-content\/uploads\/2018\/07\/Fix-Parallelize-Downloads-Across-Hostnames.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@LinuxCloudVPS\" \/>\n<meta name=\"twitter:site\" content=\"@LinuxCloudVPS\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.linuxcloudvps.com\\\/blog\\\/how-to-fix-parallelize-downloads-across-hostnames\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.linuxcloudvps.com\\\/blog\\\/how-to-fix-parallelize-downloads-across-hostnames\\\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/www.linuxcloudvps.com\\\/blog\\\/#\\\/schema\\\/person\\\/ed907227ee7d151c617e6d0fe74f531a\"},\"headline\":\"How to Fix &#8220;Parallelize Downloads Across Hostnames&#8221; 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