Yeah that’s what I’m running on this particular machine (Late 2013 27″/i7). It seems to get bogged down with any data rates higher than ProRes LT. Everything off an SSD Raid and separate SSD cache. It’s hit and miss, but lately much more miss. The exports are the problem. No problems with playback, transcodes or making proxies. After Effects seems fine, but those are much shorter exports of course. Metal is the most reliable, but only slightly so.
I’ve gone round round on this, and when you keep coming back to, “Man, I never should’ve upgraded…” You lose a little faith, ya know? (please hold any comments about upgrading, I get it all too well) especially when everything was running great on the previous version. This box cost close to $3k and to have it crippled this way is disheartening.
It’s easy enough to build projects on it and move them over to a Windows workstation for export (aside from FCPX projects obviously), but that’s not really the point.