CacheSizeMegs=32
This value represents the amount of System RAM set aside for caching game information. I recommend a Cache size of 64 for most systems with 512MB of RAM or more. Given UT2004's need for RAM, I don't suggest increasing this value higher than 64. This tweak will not impact on FPS as such, it is designed to reduce loading pauses in-game, and should be used in conjunction with the other tips to do so throughout this guide.