It works, I got 16mya in 5 minutes, one swipe is like 10000 years. My first thought was it should be faster but no, it should be slow to really show the scale. While I was scrolling I was hearing "age of war" soundtrack in my mind.
Thank you. Yes the huge amount of time it takes to scroll is kind of a feature, not a bug (in my mind)! The huge numbers of ancestors needed to see a step change is the point I was hoping to make.