Those of you experiencing problems may think it’s slow for everyone. It’s not. I have Windows 8.1 (running from SSD) and Avast is fully up to date. I have no delays opening programs. Most instantly appear. I literally cannot measure the time. Some big ones, like Photoshop, open as fast as they ever did.

May I suggest a full uninstall of Avast followed by a run of AvastClear, then a reinstall of Avast.

AvastClear : http://files.avast.com/iavs9x/avastclear.exe

Good luck.

-Noel