I know it's been reported over and over, but here's another instance:
Stroke play between me and one other person (fonde)
Royal St. George, back nine, 14th hole.
My opponent landed his tee shot just wide and beyond the hole (in a 17mph wind, mind you). It spun back towards the hole, stopping just inches away, triggering the replay.
This was the second replay of the round. The first one had no effect.
The slowdown started during the replay. You could see the shot stutter as it flew. Everything was slow motion after that. Trying to aim my shot was difficult as there was a delay between clicking and dragging and the screen updating. The shot itself was off the charts.
This is the first time I'd seen this particular bug. I've seen other replays during a match, but it never affected play. I don't recall, but maybe they'd all been a first replay and I'd never seen a second.