My longest single complaint about the game. There's a box with wind speed and direction, and yardage in the upper left corner, along with a flagstick. If there's not room up there for a line of text with the green speed at least color-code the flagstick to give us an idea. Use a scale from blue (slow) to red (tournament) moving through shades of green and yellow as you get faster. It's not a hard thing to do.
Or simply give it to us whenever we select the putter, regardless of where we are - and especially around the greens when it can be selected on a chip to get a more accurate read. It would be great to know on an approach, but if I'm close enough where you can give me the lay of the green then there's no lack of expectation that a player should also know how fast it is.
As for the comment on wanting to know for the CTTH tie-breakers, in my experience the green speed is consistent with what it was during the match, as is the wind.