I wanted to address
@Dustin07 and everyone all in one place here:
The last rep generally WILL slow down, often to a grind if you go to 0RIR - BUT, what I think I meant, is that you should always be pushing as hard/fast as possible. From a gas pedal perspective, you remain absolutely full throttle - only fatigue is costing bar speed. There should never be an intentional coasting/backing off towards the top of a rep to save energy, even for more reps. You want to train your motor units for maximum output.
I don’t usually rest with weight locked out unless I am trying to reach 0RIR on a set, and I believe that’s generally bad for the biggest lifts because we want to train them for success and with great movement. Rarely there are times when you will know reaching to the absolute limit is the right move - this is less of an issue with low rep sets. But for anything over 6 reps, I would try to leave a rep in the tank always to keep it handsome.
The hardest, heaviest, most brutal & frequently you can train & adapt, the stronger you will get faster - this is a law of strength. The paradox there, is that most enthusiastic lifters are able to out-train their recovery/speed of adaptability fairly easily. Then they get hurt, get tendonitis, have to back off etc and lose all forward momentum. In my own limited experience as someone who has been particularly successful at breaking himself, is that every program I ever trained that “took the slow boat” unequivocally got me stronger overall than programs that promised faster times to a deadline. Things with 5lb progressions, low frequency, longer training week, frequent deloads, frequently waving back, keeping a couple reps in the tank.
The key wasn’t to push as hard and often as possible. It was to push moderately hard for months and months on end without going backwards.