- Open LR - Preferences - Performance and uncheck use graphics processor
- Now restart LR and then check the usage and CPU time
Does this happen when you are Importing Pics?
Create a new catalog and check if its better
Since you are on the ill-fated version 6.2.1, the first thing to try is to turn off the "Add photos screen" in the general preferences. If this is turned on, Lightroom scans your hard disk in the background looking for any image it can find. This is probably the cause of this background activity. If this doesn't help and you are still experiencing extreme slowness, revert your Lightroom back to 6.1.1: Adobe is going back to the old Import dialog!
None of the solutions worked. I ended up reverting to 6.1.1