It wasn't that long ago that 9 on the Stimp was considered fast. Ronald's claim that they are bumpier, likely has a lot of factors as to why they are bumpier. Failure to fix ball marks, etc. Smooth surfaces, in my estimation, are capable at any speed.
With the loss of character and contours that have been forced on the golfing world, due to higher green speeds, is this another example of making the sport easier, while telling everyone, and having everyone think, they are more difficult.
Anthony, Any green speed should be adapted to. Slower speeds on undulating greens test the players ability to marry line and speed, better than flat fast greens , which mostly only tests the line of putt. Come backers are easier at almost any speed too, due to the confidence of having seen the line as your ball went by the cup on the first try. One added benefit of slower speeds would be that it speeds up the game for those 25 cappers who feel the need to hole out for a ten from 2 feet.
The newest rule in golf should be a 9 stroke maximum. Unless it's match play.