[Admins]

Graal takes 100% on Windows task manager because it needs to do good timing (each frame exactly taking 0.05 seconds) so the animations and movement don't feel weird. It is actually not taking 100%, it is just sleeping until it is time to do something again. On a decent computer you should be able to run 30+ Graal instances without slow downs (at least in offline mode, in online mode you have scripts and more graphics which might slow down it).
If the game is crashing the computer then it is a problem with the hardware (or the way Graal is accessing it), normally there shouldn't be any problems when you have good drivers for the graphics card and sound card. We will add a version check for the gfx card in v3.1 soon, because we have seen that most problems people have with Graal have to do with old gfx driver. If you have a new computer and you don't install the latest drivers of Nvidia or ATI then games will crash. May be some games will run fine because they only use the most common features of the gfx card, but I have seen many fresh XP and Win2000 installations which crash on games or video.