I suppose my problem is kinda simple. I want them back.

I noticed that my performance was relatively poor once I installed XGL/Beryl. I assumed that it was because I did not have an ATI driver installed, and it was using X was using a generic one. I also noticed that Emerald was causing everything to go green (seriously, that was not meant as a pun). But it's a distorted, you-cannot-see-anything-on-the-screen kinda green. I CTRL-ALT-BKSP to restart and loaded Gnome instead of XGL, and beryl loaded, but the performance was poor.
So, the machine is an old 1.4 Athlon with an ATI 9600 & 512mb of PC2700.
Right now, the ATI drivers are installed, but I get no cool effects from Beryl. How can I revert back to what I had, but then improve performance of Beryl and get XGL working correctly without my green issue?