<p>While debugging why a single controller test was taking over 30 seconds to run, I found out about the non-database quad_tile functions (the database ones are already well documented).</p>

<p>These are implemented in ruby in <code>lib/quad_tile.rb</code>, but there is also a C-based implementation in the <code>lib/quad_tile/</code> directory. The test suite passes if you don't have the C-based version compiled, since the ruby code is used instead, but you can speed up the entire test suite (on my machine, by 40 seconds per run or ~20%) by compiling them.</p>

<p>The only other documentation that I've found is in the chef code for the deployed version:</p>

<p><a href="https://github.com/openstreetmap/chef/blob/5b551a1cef6be428bc0b1b3ad04d0e9fe39409e4/cookbooks/web/definitions/rails_port.rb#L269-L289">https://github.com/openstreetmap/chef/blob/5b551a1cef6be428bc0b1b3ad04d0e9fe39409e4/cookbooks/web/definitions/rails_port.rb#L269-L289</a></p>

<p>From that, instructions would appear to be straightforward:</p>

<pre><code>cd lib/quad_tile
ruby extconf.rb
make
</code></pre>

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