I've had this problem for awhile, i get about 15-25 frames when a lot of people are around especially in outdoor areas, like on Badwater Basin. i have a dual core cpu, the first core is 99% and the second core ranges from 9-30%. I've lowered down the settings and resolution, neither help... I use about 2.5-3gigs of ram, with at least a gig left to spare. I have 4gb total. TF2 is using 1.1gb. my temps are fine. svchost.exe typically using the most ram in my processes at 128mb.
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