Gents,
I was doing fine with Patch 4 and the ahtest did nothing. Not an improvement nor was it a problem.
Patch 5 has been brutal. Bad, almost unplayable stutters. It sudddenly dawned on me that I had changed my AGP Aperature size from 128 to 64 some month or so ago as an experiment in another game.
I have 512 M of RAMBUS or RDRAM. Although it is often recommended to run 1/2 system RAM as an aperature setting, I have found that 128 works best for me. Regardless, after setting the AGP aperature back to 128 from 64.
The AGP setting is normally found in the BIOS under Advanced Chipset Features. Stutterers may want to experiment with this. As always, know what you're doing or DON'T do it. You Been Warned!!