If your performance gets too high you will have issues with the gamespeed code. For many Xbox games, gamespeed is tied in to the framerate. Inconsistent framerate could therefore cause inconsistent gamespeed.
It might not be *laggy*, it might just be a hiccupy gamespeed. Try turning on Vsync.
See -- everyone else be like this guy... instead of complaining saying everything's broken -- try and fix the issue.
Talked to HiredGun for a couple of emails, and they acknowledged the issue and are looking into my suggestion to revive the 30FPS mode that Halo PC and Halo 1/2 Xbox had. This is what people refer to when they say "Locked framerate" in console programming, to my knowledge.
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