Are you familiar with the concept of "riding the reset"? Frankly, it's the biggest reason for large and inconsistent group sizes. Squeeze the trigger, do not let up when the gun fires, feel the tactile resetting of the trigger as you slowly and under control, let pressure off the trigger. STOP at this point and then regain your sight picture and squeeze again for your next shot. Your follow-up shots will be more consistent and exponentially faster once you master it. Feeling the reset and understanding the mechanisms at play is easily done during dry fire.
Weeelllll for the most part this is true and valid advice....Up till you are trying to go really really fast like my son and I do in competition.
If you try for the "reset" trigger feel action when you are at 0.2 splits you might get trigger freeze or a failure to reset. There is only so fast your finger can move back, while feeling for reset then pull forward, and 0.2 is about the edge.
So take the above advice and understand it and try it but know that as you go faster between shots you will need to make sure you are seeing your front sight rise and fall.
We put in time dry firing for draw, for movement and for reloads. Just make sure you are not training yourself to be a 1 shot wonder. Since dry fire usually only allows 1 shot then you need to reset (depending on your pistol) then you can train yourself to only do 1 shot.
In our glocks we will sometimes put a bit of wide rubber band in the ejector area which keeps a glock out of battery and lets you get many trigger squeezes. The key to this is that your front sight doesn't wobble around shot to shot.