speeding up sputnik (000001)
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Date: Sun, 11 Jan 2009 15:08:55 -0200
From: "Yuri Takhteyev" <a href="mailto:yuri@sims.berkeley.edu">yuri@sims.berkeley.edu</a>
To: Sputnik <a href="mailto:sputnik-list@lists.luaforge.net">sputnik-list@lists.luaforge.net</a>
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Subject: [Sputnik-list] speeding up sputnik
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<p>A list member who wanted to stay unnamed pointed out that Sputnik's
performance can be improved quite a bit by telling the client to cache
javascript and css files. I added support for this, and also made some
other changes to make YSlow happy.</p>
<ol>
<li>Caching</li>
</ol>
<p>Nodes have two new fields: http<em>cache</em>control and http<em>expires. Both
are set to nil at the level of @Root, but are then re-set for @CSS,
@JavaScript, @Binary</em>File and sputnik/css/colors - for now to
"max-age=3D3600" and "2" respectively. The value of http<em>cache</em>control
is passed directly to the client as "Cache-Control" header, and
http_expires is interpreted as an offset (in hours) to set the
timestamp in the "Expires" header. (I expect to tweak the value and
am looking for suggestions.)</p>
<p>This means that if you do nothing then images, css files and
javascript files will be cached for an hour by the client. If you are
making changes to those nodes (e.g., uploading a new logo) and want to
see the effects, you will need to do click on "reload" button in the
browser while holding shift. (Your users won't see the new logo until
their cache expires.) This seems to speed up the loading by a factor
of 3, after the first page view.</p>
<ol>
<li>JavaScript at the bottom.</li>
</ol>
<p>I moved all JavaScript to the bottom of the page, as YSlow recommends.
This doesn't seem to make any drastic changes, though I didn't measure
it very precisely.</p>
<ol>
<li>Gzipping content</li>
</ol>
<p>I used Igancio Burge=F1o's code (see an email to the Kepler list in
November) to add support for content compression. To enable this you
would need to set "USE_COMPRESSION" config parameter to "true" and
install lzlib rock. (Available from the main repository: "luarocks
install lzlib".) Again, I haven't noticed any huge improvements from
where I am at the moment, but perhaps in other cases it would make
more of a difference.</p>
<p>YSlow seems to be quite happy now, only wishing that we were using a
content delivery network. I am guessing further improvements in
performance would need to be from server-side profiling or from
server-side caching. (Or from adding support for content delivery
networks, as YSlow suggests.)</p>
<ul>
<li>yuri</li>
</ul>
<p>--=20
http://sputnik.freewisdom.org/</p>
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