Place a 1" x 1" x 3" block of wood on the back of your hand held beside your holster.
When ready draw and fire from the hip, continuing to fire as you raise the gun - 2 to 3 shot drills with an EMPTY/SAFE handgun. You must accept the grip you get, there is no time to adjust.
If you can beat or tie the block of wood sticking the floor, you are getting the 1st shot off in under .5 seconds. Yes it can be done - guarantee it, but only from OC. CC will slow you down noticeably.
The stress level on your muscles will tire them, so 5 to 6 reps at a time, then resting is recommended.
Do this every day for a month and you'll be pleased with your new found confidence and speed.
Still trying to beat that guy in the mirror - best I can do though is an even match