I've been a devoted Kaspersky user for several years now. While it's my favorite antivirus suite, I'm convinced that it slows my computer down significantly. I know this because when I disable it, the internet goes faster and the computer just feels lighter. And when I talk about speed like this, I mainly mean mouse-click response times. For example, when i click on a URL, how quickly does the new screen appear and load. With kaspersky, you can feel it "thinking" before everything actually happens, and you can even see the icon animation in the tray showing that it's working.
My question is, do we really need all this scanning to be safe? What modules can be turned off safely? I've already turned off anti-spam and anti-banner, because I have two programs that do it better (Antispamsniper, ad muncher). But what about the other ones?