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  <section id="varnish-and-website-performance">
<span id="users-performance"></span><h1>Varnish and Website Performance<a class="headerlink" href="#varnish-and-website-performance" title="Link to this heading">¶</a></h1>
<p>This section focuses on how to tune the performance of your Varnish server,
and how to tune the performance of your website using Varnish.</p>
<p>The section is split in three subsections. The first subsection deals with the
various tools and functions of Varnish that you should be aware of. The next
subsection focuses on the how to purge content out of your cache. Purging of
content is essential in a performance context because it allows you to extend
the <em>time-to-live</em> (TTL) of your cached objects. Having a long TTL allows
Varnish to keep the content in cache longer, meaning Varnish will make fewer
requests to your relatively slower backend.</p>
<p>The final subsection deals with compression of web content. Varnish can
gzip content when fetching it from the backend and then deliver it
compressed. This will reduce the time it takes to download the content
thereby increasing the performance of your website.</p>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="increasing-your-hitrate.html">Achieving a high hitrate</a><ul>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#tool-varnishtop">Tool: varnishtop</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#tool-varnishlog">Tool: varnishlog</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#tool-lwp-request">Tool: lwp-request</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#tool-live-http-headers">Tool: Live HTTP Headers</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="increasing-your-hitrate.html#the-role-of-http-headers">The role of HTTP Headers</a><ul>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#cookies">Cookies</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#cache-control">Cache-Control</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#age">Age</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#pragma">Pragma</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#authorization">Authorization</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#overriding-the-time-to-live-ttl">Overriding the time-to-live (TTL)</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#forcing-caching-for-certain-requests-and-certain-responses">Forcing caching for certain requests and certain responses</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#normalizing-your-namespace">Normalizing your namespace</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="increasing-your-hitrate.html#http-vary">HTTP Vary</a><ul>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#vary-parse-errors">Vary parse errors</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#pitfall-vary-user-agent">Pitfall - Vary: User-Agent</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="increasing-your-hitrate.html#cache-misses">Cache misses</a></li>
<li class="toctree-l1"><a class="reference internal" href="increasing-your-hitrate.html#uncacheable-content">Uncacheable content</a><ul>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#passing-client-requests">Passing client requests</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#hit-for-miss">hit-for-miss</a></li>
<li class="toctree-l2"><a class="reference internal" href="increasing-your-hitrate.html#hit-for-pass">hit-for-pass</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="purging.html">Purging and banning</a><ul>
<li class="toctree-l2"><a class="reference internal" href="purging.html#http-purging">HTTP Purging</a></li>
<li class="toctree-l2"><a class="reference internal" href="purging.html#bans">Bans</a></li>
<li class="toctree-l2"><a class="reference internal" href="purging.html#forcing-a-cache-miss">Forcing a cache miss</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="compression.html">Compression</a><ul>
<li class="toctree-l2"><a class="reference internal" href="compression.html#default-behaviour">Default behaviour</a></li>
<li class="toctree-l2"><a class="reference internal" href="compression.html#compressing-content-if-backends-don-t">Compressing content if backends don’t</a></li>
<li class="toctree-l2"><a class="reference internal" href="compression.html#uncompressing-content-before-entering-the-cache">Uncompressing content before entering the cache</a></li>
<li class="toctree-l2"><a class="reference internal" href="compression.html#gzip-and-esi">GZIP and ESI</a></li>
<li class="toctree-l2"><a class="reference internal" href="compression.html#turning-off-gzip-support">Turning off gzip support</a></li>
<li class="toctree-l2"><a class="reference internal" href="compression.html#a-random-outburst">A random outburst</a></li>
</ul>
</li>
</ul>
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