Here's mine, while my Mac Pro (new, just got it today

Nothing stalled for even a moment, and if it seemed to, I did the same viewpoint again and it didn't stall. Totally smooth gameplay, beyond anything I ever experienced on my iBook G4Time Demo wrote:Date / Time: 7/17/10 10:18:45 (0ms)
2700MHz, 0MB
Delta\Games\Halo\Halo -console Frames=4700
Total Time=73.39s
Average frame rate=64.04fps
Below 5fps= 4% (time) 0% (frames) (3.443s spent in 4 frames)
Below 10fps= 5% (time) 0% (frames)
Below 15fps= 6% (time) 0% (frames)
Below 20fps= 6% (time) 0% (frames)
Below 25fps= 7% (time) 0% (frames)
Below 30fps= 9% (time) 1% (frames)
Below 40fps= 22% (time) 8% (frames)
Below 50fps= 32% (time) 15% (frames)
Below 60fps= 49% (time) 29% (frames)
###Sound Options###
Hardware Acceleration= No
Sound Quality= High
Environmental Sound= No
Sound Variety= High
###Video Options###
Resolution= 1600 x 900
Refresh rate= 0 Hz
Framerate throttle= No Vsync
Specular= Yes
Shadows= Yes
Decals= Yes
Particles= Off
Texture Quality= High
For further information, please visit the timedemo FAQ at: http://halo.bungie.net/site/halo/featur ... cefaq.html

Here are my settings:

Here's a screenshot I took of the first level. Note the image's size. I'm gonna make a panorama of the main bridge area for an awesome effect

