Well, yes. I know it is throttling, I just want to confirm a theory.
Not to clutter up this thread too much, but Warcraft will run fine for 2-5 minutes in the summer or 5-10 in the winter, then the frame rate will absolutely plummet. After a few minutes it will return to normal, then over the next minute or two it'll bounce between poor and good, until eventually returning to a smooth 60 fps. I have a suspicion that it's reaching an equilibrium where it has the best performance it can get without overheating, and I further suspect that that point, wherever it is, is still enough to get 60 fps out of the game.
I'm just interested in seeing the figures, and seeing how much it's actually throttled by the end.