This might be an interesting idea to implement. Lets say the tournament you entered has Very Fast greens as an average through out the round. But on the tee on one hole the green speed will indicate fast, next hole it will show very fast. The only reason showing the green speed prior to reaching the green is to be fair. This could make for some interesting play. Just a thought.
Isn't this already in place ???
Sorry, that was TOO easy, lol.