Each event's main are five 5 minute rounds with 1 minute rest breaks, not just title fights anymore. So for 25 minutes of fighting they get 4 minutes of rest. Boxing 12 round title fights are 3 minute rounds, broken up with 1 minute of resting. 36 minutes of fighting with 11 minutes of rest. Even the lower prelim fights, 15 minutes of fighting, 2 minutes of rest compared to 30 minutes of fighting and 9 minutes of rest and repairs. There's a lot more recovery time/down time in boxing during the match. I would say the "pace" is determined by the fighter, to me the Mayweather fight was boring, uneventful and did nothing to make me want to watch boxing more. There are MMA fights like that also, and then there's some great ones. If you don't understand the "laying around" portion of the sport, or the "push him against the fence" part, then you'll not enjoy it as much. I've practiced BJJ for nearly 7 years now in a local school ran Royce Gracie and Tosh Cook. To me the "laying around" part is very entertaining (sometimes they do just suck), plus I did wrestling all throughout my life. Not as many people understand it as much as a right cross to the jaw or kick to the head, and don't get me wrong, those are fun to watch also.