Overclocking. This is where you adjust the timings, frequency, or voltage of different components of your computer (or mouse) in order to boost performance (hence Over - Clock). There are many ways to overclock, the most common way is through your BIOS or UEFI. It's pretty easy nowadays.
Check out this fine video from Linus:
https://www.youtube.com/watch?v=RPmDSYRKnXM