Does anyone know of any ways to improve C2's performance apart from lowering the resolution and using "High" settings?

On my machine (a really old computer with a new graphics card), Crysis 1 and Warhead ran perfectly at medium settings and 1440x900 resolution, but Crysis 2 is unplayably slow and motionblurry at that resolution and "High" settings. My drivers are up to date, and I have the latest version of Direct X. I'm wondering if there's anything I could do with the config file that would bring the settings more in line with Crysis 1's medium.