I have created a repackaged build of Cura 4.0 with my fix for the slow rendering on Macs that don't support the newer OpenGL features that Cura uses for the advanced layer view: http://files.fieldofview.com/cura/Ultimaker Cura-4.0.0.dmg   Other than the change in the OpenGL context, it should be axactly the same as the original build, and work with your existing configuration.   Please let me know if the build works, and if it is indeed faster.