What's the deal with Pressflow 7?

Anyone who used Drupal 6 at scale knew that Pressflow 6 was pretty great. It forked Drupal and added several performance enhancements, including the ability to use external caches. Since Drupal 7 incorporated lots of the Pressflow 6 features, what’s the deal with Pressflow 7?

After Drupal 7 launched, it seemed like Pressflow 7 would continue the momentum from Pressflow 6 and greatly enhance Drupal 7. But, here we are in 2013, and you don’t hear about Pressflow 7 very often, and searching for differences does not yield much more than some diffs between baseline Drupal core 7 and the Pressflow 7 repository on GitHub. Since there are clearly some differences, let’s dive in and see what they are exactly.

A full diff as of October 2013 can be found at https://gist.github.com/alanthing/6064500 for further reading. Original post at drupal.stackexchange.com.

This post originally featured on the Echo & Co. blog.