Hi, I'm new to this forum and I'm experiencing a problem that others have had, and it's getting annoying after time.
The problem is that when I play the game, it instantly starts to stutter and drop to 7-8 FPS then it goes up to 20-30 for like 30 seconds before dropping. The game can run slow sometimes, but after the slowrun it's possible it runs normally as well. I checked Systemrequirementslab to see if my pc could run the game and it passes the minimum reqs. Yet the game still runs slow even if my pc passes the reqs. It's also 4 or 5 years old I believe (the PC).

The specs of my Laptop is: (EDIT: I do not know if Motherboard is needed, but i'm just going to put it in.)
Hewlett-Packard 3637
AMD Turion(tm) II Ultra Dual-Core Mobile M620 @ 2.5 GHz
ATI Mobility Radeon HD 4650
6GB RAM
Windows 7 x64 bit
My drivers are up-to-date.

What's causing this? I've tried the registry fix that people have mentioned on various forum and keeping google chrome open in the background, but no luck.

Appreciated if anyone have a solution for this. Thanks!