BMW M3 GT2, Monte Carlo Stage 3 - TTM, Snow Drive, Assetto Corsa

Track here: http://www.racedepartment.com/downloads/monte-carlo-stage-3-ttm.5155/

Lags a lot on this track, FPS 15-20, normal FPS 25.
Donations are always welcome.

Current System:

Intel® Core™ i5-750 (8M Cache, 4 x 2.66 GHz, 3.2 GHz with Turbo)
Intel® DP55WB
Kingston® 10 GB (1 x KVR1333D3N9/2G + 2 x KVR1333D3N9/4G)
MSI® AMD® Radeon™ HD6770 (MD1GD5)
Seagate® Barracuda™ 7200 rpm 500 GB
Intel® 2.1 Channel
HP® LA2205wg
A4Tech® N-500F
Dell® RT7D60
Cooler Master® Extreme 460
APC 1.5 KVA UPS (as backup power)