After an update done a couple months ago, avast have started slowing down my computer. The browser needs 10 seconds to start, instead of instantly, because Avast is freezing it down. The moment I turn it off, it works. This happens with some games too. I'm using Maxthon, and Windows 8.1 . The only thing I don't want to put in exceptions is the browser. I don't use other browsers, mainly because I hate them. And I don't use windows 10 because it's ugly and not very good, waiting for the next windows. We'll see.