message: faq: list possible causes for fluctuating optimization levels
  List the most probable causes for fluctuating levels of optimization in the output.
  May help with questions like
diff: @@ -728,6 +728,30 @@ origin domain, to specify the host or IP to talk to fetch resources.</p>
  <p>You may also want to consider using <a href="domains#ModPagespeedLoadFromFile">
  <code>LoadFromFile</code></a> functionality, as that performs much better if
  your resources are static.</p>
  +
  +<h2 id="varying-results">Sometimes pages are served as partially optimized. How can
  +I achieve a more steady optimization ouput?</h2>
  +
  +<p>There are two (relatively) common situations that may lead up to a fluctuating
  +level of optimization in the output:
  +<ol>
  +<li>Low traffic, combined with short http expiry times for image, css and javascript
  +responses: <br/>
  +Consider increasing the http expiry applied to the original
  +resources, or set up <a href="domains#ModPagespeedLoadFromFile">LoadFromFile</a>
  +to allow the module to load static files directly from disk.</li>
  +<li>High cache churn rates:<br/>
  +If PageSpeed's caches are sized too small, optimized assets falling out of the cache
  +may cause frequent reoptimization. <a href="system#caching">Sizing the cache</a> to 3
  +to 4 times the size of the original assets of the website should allow the module to
  +cache all the original resources plus multiple optimized variants (for serving
  +different user-agents and screen sizes).
  +</li>
  +<li>If the above did not help, the <a href="admin">admin pages</a> offer various tools
  +that may assist in diagnosing what happens.</li>
  +</ol>
  +
  +</p>
  </div>
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