Portal 2 FPS

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JP5

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I just installed Portal 2 and I'm getting rather low FPS on all video settings, around 30 FPS on lowest settings and 20 FPS on highest. NVidia optimizer website thinks I should be getting 100 FPS with high settings on my card. I have the latest drivers, defragged HDD, rebooted, and tried some ideas I found via Google such as "verifying integrity of game cache" in Steam. Other games run fine.

Key Specs:
Video: GTX 460 768MB
CPU: i7 @ 2.8GHZ
RAM: 3GB
OS: XP SP3

Thoughts on other ways to fix?
 

JP5

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GTX 460 is only a year old. I rebooted again after "verifying cache" and it seemed to correct issue, FPS up to well over 100. Not sure if that's what fixed it.
 

Overclocked Toaster

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portal 2 runs on the Source engine which has been around since 2003
 
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