Frame rate CoD4 issue

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Joined
10 Jan 2011
Posts
190
Location
Scotland
Guy's any ideas on way out of nowhere CoD4 is slowing down on my pc?
I've played hours and hours of multiplayer on it with great frame rate 90-100+ no probs and now for some reason its playing around 60 with frequent drops to 30, making it very laggy and not at all playable.

Card is only GT640 but on a game like CoD4 this should be more than enough.

other notes, nothing running in background, no steam d/ls, no changes to graphical settings in game and up to date card drivers.
 
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