My laptop ocassionally has FPS drops too. I did that my laptop but it still happens now and then. It does fix the Vista screenshot issue so that's a plus, although I don't know why CYBERJOUEURS DOESN'T MAKE GRAAL MORE COMPATIBLE WITH VISTA HI IT'S 2009.
Are you also using Vista 32bit? I'm beginning to think Graal just runs like **** on Vista 32bit but somehow works with 64bit, because that's what my PC and other Vista users on Graal seem to be using.
