Weird speed problem

[cog]

Sorry about my english, so try to use your imagination:

I only have two games: Resident Evil Remake and Tales of Symphonia. For me, both always worked faster with dual core off. Almost 30 fps all the time, except when there are several characters on screen.

This time I tried turning on dual core and Tales of Symphonia worked really fast with no slowdowns. But this happens randomly. If I restart the emulator, it becomes slow again with dual core on (20 fps). And if I restart it a couple of times more, it is fast again. I tried with several revisions and all have the same problem. I think it is a hardware problem.

My system:
Core 2 3ghz
Nvidia geforce 8600.


Any ideas?

[Chacker]

I exactly have the same problem, sometimes all my games run fast and smooth
and Metroid Prime 1 works fine 40-60fps but when I restart then the emulator or the computer, then the emulator becomes so slow and I only get 15-30fps with all my games without changing anything or doing something in the background. I´m searching for a solution...