How can I improve my performance on the range?

The best way to improve what you do on the range; drawing, firing, reloading and, most important of all, hitting the target in a timely manner is accomplished with what you do OFF THE RANGE. I know, dry fire practice is boring  - it is also vitally important. Here are a couple things you can do off the range that will improve speed and accuracy on the range.  
 
First insure all handguns and magazines are unloaded and the ammunition is in a different room. Check twice to make the chamber is clear. Lock the slide back and visually and physically inspect the chamber to insure there is no round in the chamber. After doing this, and only after doing this are you ready to begin your dry fire practice. 

First, practice drawing your firearm and bringing it onto target. your goal should be to identify your target and bring the firearm onto target in 2 seconds.  It isn't just about how fast you can get the weapon out of the holster, though that is important, you can be the fastest draw in the west, but if you are not bring it accurately onto your target speed doesn't mean squat. So, as I believe Wyatt Earp once opined, you want "to be slow quickly." SO, begin by practicing slowly and let you muscle memory dictate your speed. As your body become more familiar with what goes into presentation and accurate shot placement you will notice that speed begins to improve. 

It is'n a matter of practicing this a couple time a day. I would suggest that you do it 50 times a day - every day. And remember it is practice that makes perfect, it is perfect practice that make perfect, so don't cut corners, do it right  and don't rush it. Let your body dictate on how fast you go at first. one you get the muscle memory down, you can begin to challenge yourself on speeding it up. 

Stay safe on and off the range. 
"Chief"