It doesn’t matter if you constantly turn it on and off, this is about delaying the update check when you turn on the computer, taking it out of the early stages of the boot. This for some systems, depending on resources and what you have loading automatically on boot can be a busy time.

I would suggest checking what actually starts on boot as many programs want to start on boot when they really have no need, media players are a common one that you don’t need until you double click a media file. So only essential applications should be allowed to run on boot, basically, windows processes and security applications.

So the point is to delay that check during a busy time, essentially you should only do this is it is actually causing a problem, which in most cases it doesn’t and that is why I believe it isn’t a UI setting. Thankfully avast has the avast5.ini file to fine tune configurations.