I like TGO's 5 second drill. Really helps see how fast you should be shooting. Set up three targets (could be done on one but scoring would be a nightmare) and set a five second par time on your timer. On the first target, when the beep goes off, draw and fire as many shots in the 5 seconds as you can on target, all shots count. On the second target draw and fire as many shots on target as you can, In 5 seconds, only A's count, C and D's dont score. On the third target, in 5 seconds, draw and fire as many as you can on target. Only A's count....and anything that is not an A will subtract one A hit. So if you shoot 4 A and 4 C the 4C's cancel out the A's and you get zero.
You really have to learn how to return the gun quickly to get a good score but sloppiness has its cost.
I agree with those who say you are too concerned with splits on target and not enough with hitting the target. If you are pushing .12 with a Production gun and not reliably hitting you are shooting to fast. Alow that down to .16 or .18 and your hits will go up and overall time lost is not even worth mentioning. If you want to save time on a stage start looking at your transitions, draws, reloads, and movement. The last place you should be looking at for speed is splits.