term.

It;s likely that the CPU still runs at it's correct speed.

 

So with a format, did you re-install an OS?

Is it still doing updates etc in the background.

 

Perhaps run Norton   NPE    exe as a pre-caution.

 

Otherwise wait and see if in a coupla days if it improves.

 

 

Start with the hardware diagnostics:  F12 at powerup.

Then the configuration:

Was it slow before you reinstalled the OS?  Or is it slow now that the OS has been reinstalled.

How much RAM and what type of storage does the system have (if it's less than 8G RAM and has a spinning hard drive, the system in under-equipped for Windows 10).  Upgrade to at least 8G and replace the hard drive with a solid state drive.