I want to speed up or slow down some directx games for some test purposes. There are some tools or another methods to accomplish this?
I've found a solution:
It isn't free, but really slow down the game. I've tested with desmume emulator + pokemon white rom, and the game speed really changed. I don't know if it really speed up, but slow it does. :)
Now, I know that is possible, I can try develop myself or search free alternatives.