Drawing and aiming technique
I've been doing a lot of drawing and aiming practicing as my CCDW paperwork should arrive any day now. It definitely speeds things up to not have to rack the slide when drawing, but I've practiced that as well and it's pretty natural.
I did some reading in my psych book for PSY223 (developmental psychology), and it talks about experience-expected development versus experience-dependent development, and the synaptic pruning that is necessary. I could go into detail about it, but drawing and aiming a gun is experience-dependent as it's not a typical act for the average human, and therefore must be learned. It ties into muscle memory, which is very important in quickly drawing and centering on a target.
Something I've been doing that has drastically improved my speed is using a UV light and UV reactant sights. My front sight is already UV reactant, but the dots on the rear sight aren't, so I colored them with yellow highlighter, turned on the UV light in my room, and switched all the other lights off. This way, any aiming adjustments I need to make are more obvious as the sights are the brightest objects in the room, which means corrections come much faster. It also means I don't have to focus on the sights nearly as much, which is something you don't wanna do in a self-defense situation...your eyes should be focusing on your target. With practice, the muscle memory is learned, and I'm getting faster and faster at it.
It's something to think about for practice if you have a UV light, or fluorescent tubes that can be replaced with UV bulbs. Muscle memory is formed very quickly doing this.