Especially with the performance add-on which I had to pay for.
That sound like you paid for avast CleanUp. Complete waste of money as it does nothing you can't already do yourself with the options the OS is already giving you. All it takes is basic knowledge on how the OS is working, what things you can do with it etc.

Avast does complete the scan(s), but as has been explained in many threads already their is a bug with showing the progress.