Hi Legend
The old Superfetch process was renamed to Sysmain a while back
You can turn off that process if you wish, that will not affect the good running or performance of your PC
Superfetch is part of the Indexing service for searching your hard drive fore files and was known in the past to use a lot of hard drive activity.
Honestly if it is only using 40MB - 60MB of RAM that is not really affecting your system performance, if it was using a huge percentage of Disk, the it would be worth disabling . . .