YSK: If you have a computer running Windows 10, you should right click on the Task Bar, go to Search and untick Show Search Highlights. It's a broken feature that causes crashes and lag.
Why YSK: Your computer might not be as slow as you think.
For weeks my PC has been slow as hell when browsing the internet. The task bar crashes, the screen stretches out a bit, and then the task bar reappears. Even when this isn't happening, the computer has been very slow.
Today I found the solution showed in the title.
**Task Bar -> Search -> Show Search Highlights**
Suddenly the machine is 10 years younger.
Show Search Highlights is a new feature that seems to have been auto enabled after a windows update sometime last year. **It's probably a good idea to disable this even if you haven't noticed any problems. I don't think it's very important anyhow.**