Hello,
if you look carefully on normal speed, you'll see that the current animation speed is more or less correct ; but actually Roddick does a small pause once he's armed his serve, waiting for the ball to come down ; this pause is currently missing, I'll try to add it for next update.
If you wonder why the pause isn't already there, it's coz I mainly work frame by frame without a time-line, and after that, I look the whole animation to try to correct the whole timing but sometimes not carefully enough...
