This is the fully-functional, fast Varnish URL query string param sorter that won our coding competetion. I wrote about my entry a couple weeks ago: <a href="http://blog.jasonmooberry.com/2012/09/what-i-learned-from-my-first-c-coding-challenge/" rel="nofollow">http://blog.jasonmooberry.com/2012/09/what-i-learned-from-my...</a> This one beat mine by about 400k urls/sec. ~2.6m urls/sec.<p>We have been using it in production on our Varnish 3.0 servers for a couple weeks now and it's solid.