Hey mate, I own a similar laptop, the Acer Aspire 5750 Laptop, and let me tell you, these laptops are terrible for gaming in general, and will not see a major improvement through overclocking. Your best chances of improving performance in PR would be to purchased a low-end gaming desktop, but if you're short on cash, these are ways you can improve the performance of your laptop.
1. Turn all of your settings to low or medium/low, except for view distance, which is critical in PR.
2. Delete your BF2 Cache
3. Download and Run CCleaner.
CCleaner - PC Optimization and Cleaning - Free Download
4. Defrag your harddrive
5. Download MzRAMBooster, run it every time you load a new map to get rid of the previous statistics still using up your video run.
6. Download Process Lasso and set pr.exe & bf2.exe as a game/multimedia process
7. Scan your computer for viruses. I'd suggest Malwarebytes Anti-Malware
8. Close all other programs while playing PR
By following the steps shown above, I was able to raise my average FPS in PR from around 25 to 40. However, if you're still getting a terrible FPS in PR (<25fps), then proceed with either the following
9.a) Turn your view distance down to around 75%, avoid operating assets or taking on roles which require long-distance spotting. Acting as a medic will be a great alternative.
9. b) Keep current video settings, but adopting a slower-paced gameplay strategy in PR. Such as sniping, scouting, commander, etc.
