I'm not on GitHub so I'll have to report any issues here.
1.. vSync no longer works. It is always off no matter what value I put in the vSync() command
2.. I understand that the IDE is an app itself and so to expect an FPS reduction during development. However without the IDE open my game now runs at 290FPS whereby on AppGameKit Classic 2018-07-12 it ran at 670FPS. Also in full screen it's even slower.
Just checked with AppGameKit Classic 2019-02-18 and sure as fate both the above issues are exactly the same ( I can't use 2019-02-18 as the IDE is blurry and slow ).
Somewhere between AppGameKit Classic 2018-07-12 and the latest version(s) then FPS on the Mac has dropped dramatically by 50%+ - As things stand now I can't use the latest classic version because the IDE is super slow and blurry and the AppGameKit studio produces 50% reduction in FPS as does the latest classic version.
Looks like I'll have to stick with the old classic 2018-07-12 version until the Mac side get fixed