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    <h2>1. Capistrano deployment speedup</h2> <h3>(1) use capistrano built-in task 'deploy/assets' to deploy.</h3> <p>Capistrano has its own built-in task 'deploy/assets'. It will automatically do task for you.</p> <p>The difference between your own handcraft task is it only load <code>assets</code> group to precompile assets, not whole environment.</p> <p><code>cd /home/apps/APP_NAME/releases/20120708184757 &amp;&amp; bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile</code></p> <h3>(2) skip precompile process when assets aren't changed.</h3> <p><a href="https://gist.github.com/3072362" rel="noreferrer">https://gist.github.com/3072362</a></p> <p>If </p> <ul> <li>app/assets</li> <li>lib/assets</li> <li>vendor/assets</li> <li>Gemfile.lock</li> <li>confir/routes.rb</li> </ul> <p>are changed, it will recompile assets. Otherwise, it will skip the pecompile process, save a lot of time.</p> <h2>2. Use @import carefully.</h2> <h3>(1) avoid using <code>@import "compass";</code> directly.</h3> <p>It will both work when you </p> <p><code>@import "compass";</code> or <code>@import "compass/typography/links/link-colors";</code> in SCSS.</p> <p>But <code>@import "compass/typography/links/link-colors";</code> is 9 times faster than <code>@import "compass";</code> when you compile assets.</p> <p>That is because when <code>@import "compass";</code>, it compile whole compass assets. not only just <code>link-colors</code> part.</p> <h3>(2) avoid using partials</h3> <p>In SCSS, we like to use <code>partial</code> to organize our assets. </p> <p>But only if you need to share variables, or there are necessary dependencies, otherwise</p> <pre><code>//= require "reset" //= require "base" //= require "product" </code></pre> <p>is faster than</p> <pre><code>@import "reset"; @import "base"; @import "product"; </code></pre> <h2>3. don’t require .scss &amp; .coffee for no reason</h2> <h3>(1) avoid using require_tree</h3> <p>When we use Rails generator to generate controllers. Rails will also generate assets likes this</p> <ul> <li>product.css.scss</li> <li>product.js.coffee</li> </ul> <p>and mount assets in application.js using this techniques:</p> <pre><code>//= require_tree </code></pre> <p>But the empty assets (output nothing) which only contain this lines:</p> <pre><code># Place all the behaviors and hooks related to the matching controller here. # All this logic will automatically be available in application.js. # You can use CoffeeScript in this file: http://jashkenas.github.com/coffee-script/ </code></pre> <p>It will cost you about 250ms to compile each of them. If you have 10 empty assets, it will be 2.5 seconds .</p> <p>Remove them from your project, or mount them individually in application.js like this:</p> <pre><code>//= require prodcuts //= require users //= require albums </code></pre> <h3>(2) Don't use <code>css.scss</code> or <code>js.coffee</code> if unnecessary.</h3> <ul> <li>Compiled jquery-ui-1.8.16.custom.css (0ms) (pid 19108)</li> <li>Compiled jquery.ui.1.8.16.ie.css (0ms) (pid 19108)</li> <li>Compiled jquery.js (5ms) (pid 19108)</li> <li>Compiled jquery_ujs.js (0ms) (pid 19108)</li> <li>Compiled custom.css (14ms) (pid 19108)</li> </ul> <p><code>custom.css</code> is <code>custom.css.scss</code></p> <p>Compile pure CSS and pure JS is fast ( cost almost 0 ms). But compile .scss and .coffee still cost some time.</p> <h2>Summarize</h2> <ol> <li>replace deploy.rb assets task.</li> <li><p>check logs/production.log</p> <ul> <li>find slow assets</li> <li>remove @import "compass"; use alternative solution.</li> <li>use require instead @import; ( use @import when it is really necessary )</li> <li>remove require_tree, mount assets individually</li> <li>remove empty .scss and .coffeescript</li> <li>use .css when assets are pure CSS.</li> </ul></li> </ol>
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    1. POHow can you speed up the Rails Asset Pipeline precompile process?
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