Here's a guide I used a while back, and since then there has been a massive improvement in my FPS, and overall computer speed.
Also if you don't care about looks, on tweak number 2 hit adjust for best performance. Hope this helped you, and if it did please leave a comment
P.S: Also works for Windows 8
link: Speed Up Windows 7 – Master Tutorial to Make Windows 7 Super Fast - Tweaking with Vishal
Virus scan: https://safeweb.norton.com/report/sh...-super-fast%2F
https://www.askvg.com/master-tutorial-to-make-your-windows-7-super-fast – Virus Scan Results