You have seen me when I first started. I move like a ballerina now compared to back then.
USPSA is speed, power, and accuracy. The scoring is a bit complex, but it's ultimately a function of how accurate you are and how quickly you complete the stage. You can see the timing device that the Range Officers are using in the videos. The buzzer goes off and the timer begins. The timer updates itself each time it hears a shot so your time is that last shot you take.
The rub is that you can incur penalties for misses, failure to engage targets, and other procedural violations.
Power is a function of your ammo. Your ammo has to reach a certain "power factor" (bullet weight times velocity) depending on which division you are shooting in. I'm shooting "Production" where pretty much everyone shoots 9mm.
The colors are just me being festive. If I can shoot well, I can at least look good while I'm doing it. I picked University of Florida colors since I'm going to school there until I graduate or they kick me out. Coin toss on which result happens first.
I do have blue grip tape on my Glock because it looks nifty and it rains quite a bit in Florida in the summer. I also have it on my mags. It helps me grab the mag and the individual numbers on the magazine allow me to keep myself organized and to I can ID a bad mag if one starts to give me problems.
Ammo placement is a rule. It also depends on your division. In the division that I am in, the magazines have to be past your hip bone which is why you see my mag pouches pretty much going to the middle of my back. In some of the more "speedier" divisions, you can have them anywhere.