I am using Dolphin Beta 3 x64 on XP SP2 x64 with an athlon64 X 2 3800+ @ 2.0 Ghz, Geforce 6150LE, 1024 MB of ram.
The issue or alleged tweak is weird in it self, on Sonic Adventure 2 Battle I was usually getting about 20 - 25 FPS on some levels and never above that, with it dipping below...