Re: Quicker on some days then others??
1. Good meal + water 3 hours before playing
2. Take the best bathroom break possible
3. Warm up
I only stretch my legs and arms after I warm up. Otherwise I find stretching just increases injury risk for non-professional athletes.
Also, make sure you are on a solid lifting and cardio schedule to tune your body. That will help your consistency, among the other important benefits.
Also, you may not be bending your knees enough when dribbling all the time. Makes a big difference on your first step.