Good stat's low FPS? Help me, please.

Well, I had started crossfire again a few days ago for the first time in months, and it's laggy; the only time's it's not laggy is when it's in Arena with like 4 players and less, I used to be able to run this game 16 people no lag 50+ FPS.
Here's my stats guys.


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:

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