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Four Kitchens maintains Pressflow, a free, open-source derivative of Drupal featuring extensive performance improvements while maintaining compatibility with contributed modules.

We currently maintain Pressflow 5 and 6, which are derivatives of Drupal 5 and 6. Both have built-in support for Squid and other reverse proxy caches. We used Khalid's patch above for Pressflow 6, and we also adapted his patch for Pressflow 5, which required backporting some related proxy support code from Drupal 6.

If you'd like more information about how you can use Pressflow to scale your Drupal projects, please contact Four Kitchens:

http://fourkitchens.com/contact