Ever since I installed tf2 on this laptop Ive been getting less than 30 fps, and it's only getting worse with the updates, I didn't use this laptop for a while because I bought a desktop computer but it broke and i have to use my laptop again, and when I did I wasn't getting over 10 fps even with Chris' fps config, I've tried out many of my friends configs and at best Ive gotten 40fps on a MGE map with only me and my friend playing but even then my fps dropped to around 20 when I looked around too fast.

my specs:
OS: [Windows 8.1 (64 Bit)] Build: [6.2.9200.0]
Processor: [AMD A8-4500M APU with Radeon(tm) HD Graphics] Cores: [4]
Graphics device: [AMD Radeon HD 7640G]
System type: [64bit operative system, 64bit based processor]
RAM: [8,00 GB (7,19 GB usable]

pls help ;w;