There are many people with low-end computers out there (a.k.a. ). There's an easy fix to it. Fact is Microsoft Windows has many Services, Applications which we gamers don't need.
Here comes "NTLite". NTLite is a software which will help you modify your Windows ISO. You can remove unwanted services through it and get better performance the next time you play.
Pro Tip: If you want even better performance, you can remove AutoStart applications.