Speed up TAL GUIs on macos

[Hanz Meyzer]

Might be not working for you, but it works for a bunch of vendors like U-He or UVI: If you set the graphics mode to async, macos then will most likely draw the GUI on the GPU then, with fluid 60fps, no matter of scaling.

Please have a read here:
https://github.com/aseprite/laf/commit/ ... f30412f02a
https://forum.juce.com/t/slow-frame-rat ... s/35813/23