Alex, what you're describing is Tour trajectory, aka the Teardrop. The apex of the ball flight is beyond the halfway point.

This is by and large a product of good contact. Swing speed is a secondary consideration.

I've had this ballflight a few times in my short golfing career, and each time, it was due to finding the sweetspot, coupled with a great impact position - no throwing the clubhead early, no holding off the finish.

It's a beautiful thing to see, and really helps in holding greens.