You have a slight weight shift towards 2B as you go into knee lift. That tips off the runner you're going to the plate and it makes you slower to the plate. It can also affect your control. Fortunately, the base runner in the video wasn't perceptive enough to notice it or else he would have taken his secondary lead sooner. To fix this, narrow up your feet to about shoulder width.
Next, you don't use your lower half effectively. Specifically, you don't get your center of mass (think "hips" or "butt") moving foward until after the peak of your front knee lift. Trying getting your butt moving forward sooner - closer to the peak of your knee lift.