hi,
There is big issue with Avast … Disk usage is impressive !!!
Avast uses 100% of HDD and SSD for a long time everytime Avast Service is launched (it’s like if it scans every file in installation folder) and hundreds of files are read !!!
Every time i launch avast … it reads hundreds of files (files that don’t have any link with the functioning of avast).
You can test it easily … launch “resource monitor” and enjoy the “AvastSVC.exe” activity !!!
So if you have HDD so you can add 1 or 2 minutes to windows start to be operational.
With HDD Avast Launch takes more time than All Windows Services to Start … it’s amazing 
This happens Even when all shields are disabled.
Avast was a very light software … now it is becoming a heavy software like Kaspersky and others 