How many joints are you moving each turn?
if you're doing measly movements like moving 2 joints and then spacing for 50 frames, then you're gunna look slow.
It's as simple as this: the more joints you move each turn, the fast your tori will look. You'll also want to pay close attention to timing and know how the physics of a human work. Like if you were trying to do a back flip but you lowered your arms too early, the back flip wouldn't look that good, would it?
In a nutshell, learn physics
If you're not talking about actual replays themselves and talking about videos, then be more specific next time.