Bad performance / RAM usage 25-30% with nothing open

TairikuOkami said:

Try to perform some cleanup, for starters, run CMD as admin and enter:

Dism /Online /Cleanup-Image /StartComponentCleanup /ResetBase

when it finishes, enter this one and select to clean everything:

cleanmgr /sageset:65535 & cleanmgr /sagerun:65535

Did that , unfortunately it didn't fix it

I had a similar situation happen to me after the last Windows 10 update. My computer would use 30-40% of my memory even when idle with no programs running in the background.
I fixed it by stopping the Superfetch Service and setting it to disabled, rebooting, and then starting the service again and setting it back to automatic. After that everything was back to normal with 8% memory usage when idle.

Rich87 said:

I had a similar situation happen to me after the last Windows 10 update. My computer would use 30-40% of my memory even when idle with no programs running in the background.
I fixed it by stopping the Superfetch Service and setting it to disabled, rebooting, and then starting the service again and setting it back to automatic. After that everything was back to normal with 8% memory usage when idle.

Didn't worked