I think 6 and 7 mac have big performance issues. 2d drawing, material editor, Layouts. They feel insanely laggy, even on small files. I swithed to 7 wip because it feels slightly faster. But still far away from 5, which is fast even on my 15 year old wrecks, which I do not use anymore.
I use on my macs AutoCAD, Affinity Photo Designer Publisher, AD Lightroom, Blender etc. No performance issues at all. Only Rhino 6/7 gives me big trouble.
As written above I dumped 6 because I do not see any point in using it. I started a thread some days ago