I don't buy that it's "generally known" that the slowing of the courts is really about the balls. That likely means you vaguely remember some commentator saying it and maybe read something about it on someones blog. Not to mention that you're like nailing jello to a wall on this stuff. Why so much complaining about the surfaces, especially the grass at Wimbledon, when what you really meant was the balls? Look, I'm not going to deny Surface Change, but what do you say we stop acting like we know exactly what happened, when it did, and what the ulterior motives were, beyond improving viewer enjoyment. Tournament directors seem to be rather cagey about talking about changes made to their surface (though Wimbledon did cop to changing the composition of the grass in 2001, or whatever everyone sites. Occasionally there's a bit of a kerfuffle over balls, but I've tried googling these things and good luck finding anything concrete.