Do you have a shot timer or phone app for one? If not, it's hard to figure out what "feels" fast vs. what is really fast on the timer.
There are few areas where shot to shot speed is important, multiple shots on the same target, transitions between targets and shot to shot reload time.
For multiple shots on the same target, I like the 1-4-1 drill. Draw and fire one shot, record the time. Draw and fire 2 shots, record the time. Keep doing this up to 4 shots, then progress back to 1. Run the whole thing 3 times and try to improve your times on each run.
Transitions take practice transitioning between targets (duh). Practice shooting at least 2 shots on the first target then transition and finish with two shots on the second target. Practice with targets at different distances and in different order, near to far and far to near. Blazing .19 second splits and a 1 second transition are a not as smooth and efficient as .25 splits and a .40 transition.
For reloads, do a lot of 1 shot, RL, 2 shots practice. You need to make sure that you are finishing the reload with a good enough grip and sight picture to make 2 good hits. Slamming a reload in and slinging a "Hoper" at the target is a bad practice.
Gringop