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Dirt 3 framerate tanks suddenly for no reason

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I'm experiencing an issue where frame rate will drop from 150+ to ~30 or lower. This continues until I press alt+enter to switch between windowed and fullscreen modes. It usually starts when I am going from a race to a menu, or vice versa, but it has also happened in the middle of multiplayer matches, forcing me to alt+enter mid-race (and thus put me at a great disadvantage).

This occurs both at lowest and high settings, windowed and fullscreen, no-vsync and vsync.

CPU and GPU temps don't stray above the 40s.

My specs: 
i5 4440
GTX 660 2GB
8GB RAM
Windows 10 64 bit 
Updated to latest Nvida drivers.

I'd be grateful to anyone who can help me with this issue. Sadly I am on the verge of refunding the game.

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I figured it out - my GPU wasn't giving it all its power. I set power usage in Nvidia settings to maximum performance, rather than adaptive.

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