FPS issues in Counter Strike Source

Pedro-rc

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Jan 21, 2015
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Hi, I bought my laptop a few months ago and i can get 300+ fps playing counter strike source. But lately everytime i start the game for the first hour or so, the fps for some reason dont seem to go over 30 with vertical sync off. If i turn Vsync on it goes up to 60 which makes it bearable but it is still hard to play for me. After about an hour they suddenly go back to normal. Can somebody tell me what is wrong and how to fix it?