Low FPS, good PC?

Manufacturer:
Sony Corporation
Processor:
Intel(R) Core(TM) i3 CPU M 330 @ 2.13GHz (4 CPUs), ~2.1GHz
Memory:
4096MB RAM
Hard Drive:
488 GB
Video Card:
ATI Mobility Radeon HD 5145
Monitor:
Sound Card:
Speakers (Turtle Beach USB Headset)
Speakers/Headphones:
Keyboard:
USB Root Hub
Mouse:
USB Root Hub
Mouse Surface:
Operating System:
Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_gdr.101026-1503)
Motherboard:
Computer Case:

Is my specs, and I'm getting like 20 FPS in a game with 10 people, when it's like 5 I get about 35, I used to get a smooth 50-60 all the time?
HELP.

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