andyson: No Jim, Courteneyfish is right. It takes longer for the same putt to get to the hole on Faster greens therefore the ball is moving slower on Faster greens.
Yes, you're both right but to a player new to the speeds they need to think fast and adjust the power of the hit accordingly-like slow it down. I think the actual speed of the ball and strength of the swing get easily confused when you don't expound on it.