add your vote!
be more specific on the game please
anything with a bunch of rigid bodies gets slow
python and complex logic can make things slow
but so can having lots (as in tens of thousands) of polygons
but I would say blender eats cpu rather more quickly than it seems it should. Especially for armature deformations.
I think that this subject has been answered to death alreaty : do a search.
Otherwise it is card-cpu-ram if you have 256 Mb RAM or more. This is just a best bet, the conditions vary and so do the results.
so i need more ram
no, I have 386 and my comp still runs blender like crap. And I think its 'cause my processor’s speed is 900