[slingerland59]

The speed comes from finger control. Mind you, with a good fulcrum (grip between thumb and pointer finger at the point where the stick is balanced) and finger action (moving all remaining three fingers together to propel the stick), you get power too. And you also get the ability to play precise beats very quietly. There's no better skill you can learn IMO than finger control.

Try practicing with slow, very big, exaggerated strokes where the butt end of the stick goes forward and the tip comes toward you so the stick is parallel to the ground, then use your three last fingers and wrist motion to whip the tip onto the drum (or pillow or chair pad even). I liken it to flicking a towel at someone or throwing a knife. I keep a pretty tight fulcrum grip so the stick doesn't go flying!.

That's a power stroke if you also bend your arm to add to the swing. That's how you break sticks with a rimshot or tips on a cymbal.

The fast single stroke roll like in the video clip is the same finger action but with no arm action and very little range of wrist movement. Some guys turn their thumb up, as in the second video clip from shazaam. That is a tympani playing technique. Practice, experiment, enjoy the improvement in your playing.