No scientific study just experience. I can move metal faster on my Hay Budden 106 pound anvil, which has 80% rebound with a steel ball bearing, than I can on my 110 pound Vulcan anvil which, has 50% rebound with the same steel ball bearing.
I still love the Vulcan my first London Pattern anvil and use it all the time, but if I'm moving a lot of thicker stock, I turn around and use the Hay Budden, using the same hammer. Both anvils are mounted to tree stumps.
I can't control the wind, all I can do is adjust my sail’s.
Semper Paratus
If I have a lot of thicker stock to move, I walk the 4 steps to the 30 pound Star power hammer.