Taken from Blue's News:
id Software CEO Todd Hollenshead posted an update on the Quake3World forum, discussing the performance and new features of the Quake III: Team Arena demo that was released last night (story). Here is an excerpt:
First, thanks for all of the positive feedback. We really appreciate it.
I wanted to give people some tips with areas that appear to have a few people confused and just share a little more info. Some people have complained about performance issues vs. Quake III. While it's true that Team Arena is more resource demanding than Quake 3, I think some of the performance issues may be driver related (so make sure you have the latest). Ideally, you should have 128 mb of RAM. 64 mb systems will run the game, but probably not super fast with high graphics settings. You can adjust almost every graphic detail from the menus, so try turning a few things down and see what happens to your framerate. The map we released is a bit performance intensive (compared to many other TA maps) and we understand that.