OK, so far the lowest my fps has gone is 18 fps but went right back up to 30 to 35 fps in windowed fullscreen mode Ultra-High settings. Eyefinty and SLI is without a doubt not working properly.
I only see a few FPS difference personally with my iMac 27 inch Late 2013 with Nvidia 780M But there does seem to be a different behaviour with the MBP and how it handles Retina display.
It's the opposite for me - windowed will get about 20-25, fullscreen will be 35-40. I hardly ever get above 40 fps now since 1.2.3 whereas before that I could get 45-60 at fullscreen on my 2009 machin
and for large scale battles I'm stuck at 15-20 fps with client crashes happening randomly throughout my game day. Repaired the client multiple times, did a clean reinstall, disabled all addons, even
About client performance problems (fps drops): I believe there was another major change to how the particle systems work in Update 4. Even a single DK standard used in PvE will cause a fps drop for me
so the game has been running well at 50-80 fps since launch.. since 1.6 i have been experiencing random fps drops where it goes from 50 to 5 fps and a few second back up to 50... this has happened at