I have not hit the "update program" button yet. I normally wait for a mod update or two before going to a new version release of any application.
I also do not install all scannning options for any Malware product. Files system, Network, Behavior, and Script are the only sheilds I run Real-time on Avast. The other sheilds are redundant, imo.
I do not opt-in for minute-to-minute updates, twice a day is frequent enough, or Reputation services (Cloud Services). Also in settings, I did establish an Account, but do not participate in Community. These options, imo, are unneccesary and place a drag on what Avast is built to do - protect against Malware.
If you were happy with Avast 7, can you uninstall avast 8 (use Control Panel & the Avast uninstall app) and re-install avast 7? This of course implies that you have a full install download pkg of Avast 7, not a web shim install.