This was indeed introduced with Patch #7 (Hotfix #27) on Mac and I confirmed that Hotfix #28 still does not resolve it (to be fair there was no such claim in the release notes). I also wish more attention was paid to the Mac. I used to hit 60fps in Act 3 and not only it was dropped to 45 or lower, but worse, there's choppiness and sudden "jumps" in the frames presented. As other people have observed, after loading, the game is smooth @60fps, but once the machine heats up it's as if it throttles (which was not the case with Patch #6: the fans would go really loud by enabling High Power mode and it would preserve the FPS).
