A new version 405B patch for Unreal Tournament has been released by Epic. The Unreal Technology page has a complete list of what's new, as does our local copy of the patch (4.5 MB), which, of course, includes a list of mirrors. In addition to bug fixes and new features, the patch also provides what are described as performance improvements, including: "Improved bit packing for network packets (server performance improvement)." Here's the word on compatibility from Alan Willard's .plan:

The new UT patch (405b) was released today, pick it up at your favorite UT website. It is COMPLETELY network compatible with previous versions of UT, so never fear, if you don't download it and your favorite server does (or vice versa) you will still be able to connect and play!