Sudden Slow screen w/o lag

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Hi everytime i play P99 on my laptop i get a sudden slow walking slow casting anything i do just seems slow and it is very random when this happens...happens when i play thru wineq2 and w/o using the program maybe someone can help me out here?. Running windows 7 intel Celeron, 2 gigs of ram. no Virus program running. anyone else have this problem or know a fix?