Лагает (подвисает) Civilization V (на норм компьютере) В чем проблема?

Моя система:
OS Version: Microsoft Windows 7 Профессиональная
System RAM: 3327 MB
CPU Name: AMD Phenom(tm) II X4 840 Processor
CPU Speeds: 3208
Physical CPUs: 1
Virtual CPUs: 4
Video Card Description: NVIDIA GeForce GTX 550 Ti
VRAM: 1023 MB
Primary Display Resolution: 1920x1080
Multi-Monitor Desktop Resolution: 1920x1080
Microphone: True
Language: Russian (Russia)
Free Hard Drive Space: 19184 MB
Total Hard Drive Space: 66566 MB
Windows Experience Index Rating: 5.9