TopWinPrio

TopWinPrio is a software that lets you give more priority to certain applications, making some of them run faster while others are almost paused.

This can be especially useful to fully enjoy video games, since your entire PC's performance will be focused on that while other programs run in the background.

However, you need to be careful if you use the application with online games, as it can interfere with the network drivers and produce quite a bit of lag.

TopWinPrio is a tool worth trying if your computer runs slow, since it's quite likely to improve its overall performance.