Using a camera with a shutter speed of 30fps, an average ML catcher's glove to glove time would be 2.0. That's 60 total frames. An average ML catcher is in the 17-22 frame range from 1st contact to release & in the 35-40 frame range from release to 1st touch at 2nd.As you can see approximately 2/3 of the glove to glove time is taken up by ball flight.Certainly a quicker release is a factor(By catching the ball deeper, shorter & quicker momentum step,separation in front of your body,getting the ball up out of your glove,etc), however IMO the focus should be on throwing velocity. The best way to improve your throwing velocity is to improve your arm strength.(Intent,sequencing of body parts, efficient application of force,etc)
Lots of factors go in to this process. IMO the use of video analysis is the best way to see what you need to improve your glove to glove times & to measure the effect of your adjustments.
JW