D3 Transition Stress Test (youtube.com)

Again, kudos to Mike & Jason

I haven't see any JS library that performs so well when working with transitions (animations) fired in rapid succession on multiple elements with different handlers

In this example, I move the mouse over the map and as I do that I tween the donut either to the state's vote totals or the national total, depending on whether or not the state has any votes

It works miraculously well

http://www.youtube.com/watch?v=K3Qh6VoYAGk