This may be relevant to this discussion. We have discovered a problem with retina screens where Max is redundantly calculating 4 times the number of pixels for the display. This only affects retina machines.
To work around this, ‘Get Info’ on the Max Application and then check the "Open in Low Resolution" check box.
We’re looking at adding some kind of compatibility mode to this, but in the meantime, if you are experiencing problems with performance, running Max this way should help.