I found some things that helped. First, download 'vista-anti lag' for online, http://vista-anti-lag.software.informer.com/.
In your nvidia control panel, disable PhysX. Also disable ANY forced AA,AF, or pre-rendered frames over 3.
Third, download FPS limiter. http://www.node357.ca/games/FPS_Limi...imiter_0.2.zip. There are many files, one is a .bat creator. Just put in the location of your halo 2.exe, cap the FPS at 60, and make sure ALL vsync is off too. This, for some strange reason, helps choppy-ness a lot.
I'm not back to getting FPS in the 60s, but instead of getting FPS in the 20s or, for some strange reason, VERY choppy.....40s (which I know makes no sense), I get smooth fps in the 50s. Or just downgrade your nvidia drivers to ones that are version 176 or older, if you don't mind performance drops in other games. Of course, I like it the 3-step way, especially since I can always use the newest drivers.
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