Drastically poor performance on a high-end Imac 5k 4r7

[shanewarild]

I’ve just now installed 4r7 on my 5K imac 4ghz i7 32 Gb ram.

I’m getting very poor performance on this machine in contrast to my experience with PC versions over the past 5 or so years I’ve been using Zbrush. what do I need to do to get things working properly?

My model is at about 4.5 mil, I cant poly paint or sculpt effectively at high res.

[Altea]

If it is a retina display with super high density display you probably need to return to normal resolutions for only Zbrush. Zbrush doesn’t use 3d cards and can not handle very high display resolutions. Other possible reason is to set dynamic subdivisions in high poly objects by accident, another thing for what Zbrush is no designed.