Don't even bother if you have a MacBook or a Mini. Demo ignores the widescreen option (though it is set) and doesn't allow you to choose widescreen modes like the native 1280 x 800. It is barely playable at 640 x 480 with all of the graphics options set to OFF. (And with all of the graphics at their lowest settings the models look terrible with hard edges down the vertical center of their heads and bodies.) Having the game auto detect the best settings for me it turned everything ON. Yeah right.. It looks amazing for about three seconds when it starts into the intro to the game with everything turned on. I wasn't expecting amazing performance out of the game, but it should be smooth to play with everything turned off at the lowest resolution. The UI however is VERY responsive and smooth. I am not going to even bother messing with a CFG file to get it to run any better. I know the integrated Intel graphics aren't stellar, but I see no reason for the performance to be so bad with a gig of ram and SMP support and all the pretty stuff turned off. Graphics slowness wasn't the only issue, loading during cutscenes had significant lag where the screen would simply get stuck on a frame while audio continued. Walking around in the first level it seemed like it was having to cache and load constantly causing long pauses. (more than a second or two is long while in the middle of playing.) I think I will download the demo for Windows and go check it out under bootcamp to compare the two.

Earth is under siege by the Strogg, a barbaric Alien race moving through the universe consuming, recycling and annihilating any civilization in their path. in a desperate attempt to survive, an armada of Earth's finest warriors is sent to take the battle to the Strogg home planet.
Quake 4 enlists gamers in the role of Matthew Kane, a member of the legendary Rhino Squad, to penetrate deep into the heart of the Strogg war machine and engage in a series of heroic missions to destroy the barbaric alien race. QUAKE 4 begins only moments after the events of QUAKE II, with the Earthís fleet launching a massive offensive to the planet Stroggos.
As Matthew Kane, gamers invade the alien stronghold, fighting alone, along side other Marines, and in mechanized walkers and hover tanks as they encounter the Strogg and their disturbing amalgamations of man and machine. Built on id Software's revolutionary DOOM 3 technology, QUAKE 4 also features fast-paced multiplayer competition modeled after the speed, style and feel of QUAKE III Arena.
Requirements:
· PowerPC G4/G5 or Intel chipset
· 1.67 GHz or faster
· 512 MB or higher
· (ATI): Radeon 9600 or better
· (NVidia): GeForce 6600 or better
· Video Memory (VRam): 64 MB.