Corrupted registry can cause a whole host of errors and problems. If you have a lot of unnecessary registry keys that are hogging up your computer resources, your computer is bound to choke. So it is good to clean registry error at regular time. Download Anvi Cloud System Booster which is a cloud-based system optimization software helping speeding up computer.
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Depending on your RAM spaces and your computer usage, this could also be a issue. It does not allow you’re RAM to function properly if having an insufficient amount of free space.
Spyware could be the culprit, so do a scan and see if your computer is infected.
Lastly, hard drivers can be the problem if new hardware has been added to the system. So, the drivers should still be up to date.
So if your computer becomes slow, generally, you can fix them according to advice above.