I use Avast from 2009 and always get not only engine and virus definition update but also program update.
I once updated program to AVAST 2014 Program update (9.0.2006) a week ago.
Start from there, my notebook became slower and it took too many things to check, scan & notify.
It’s getting my notebook memory too much and my notebook started hang and even frozen also that I need to take hard shut down several time.
That’s not good for my hard disk so I reinstall my windows and then use AVAST 2014 Program update (9.0.2006).
But still, it my notebook started hang and even frozen also that I need to take hard shut down.
So I downgrade my avast software version from 9.0.2006 to 7.0.1474.

Please help to keep Avast go lightly.
Cause that’s a main reason why I choose Avast and leave other anti virus.