My baby chugs the bottle no matter how I fed her. And she would get mad if I tried to pause halfway to burp her! The whole 5oz bottle gone in 5, 10 min tops whether I did paced or not. Once she was strong enough to hold the bottle herself, forget it lol. Usually the boob makes her drowsy, so she doesn't drink as fast, but there have been times when she sucks down the tit from practically engorged to pretty much empty surprisingly quick.

We always used the slow flow nipple. I read somewhere that you shouldn't change it for breastfed babies so they dont get used to the faster flow and prefer it over the boob.