And why you might want to
How to Disable SysMain (Superfetch) Service on Windows 10
Superfetch is a Windows system process that has had several names over the years. In Windows XP it was known as Prefetch. Superfetch was introduced in Windows Vista, and in the latest versions of Windows 10 it is now known as Sysmain.
Ultimately, the goal of each generation of Superfetch is the same: improve Windows performance by preloading the apps you use frequently into RAM before you need them. But what is Superfetch?
In the latest versions of Windows 10, the Superfetch service now appears under the name SysMain. In Task Manager, it is listed as Service Host: SysMain.
