Turning off one Windows setting made my 5-year-old PC feel new

I noticed something weird in Task Manager one day. My disk usage was sitting at 100%, and I didn't have anything open. I checked what the disk was using, and a service called SysMain was near the top of the list. It's been part of Windows since Vista, originally called Superfetch, and is enabled by default on every PC. I'd never noticed it before,...

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