This beta version of KiGB is working fine so far.
I'm using the opening of Lufia 3 (GBC) to test performance.
Graphics are setup to use HQ3X.
Testing was done with the Fast Foward button held down.
MacBook Air 2017: OSX 10.14.5 - i5-5350U @ 1.8 GHz - Intel HD Graphics 6000 (the only machine that can run the beta)
MacBook Air 2010: OSX 10.13.6 - Core2 Duo SL9400 @ 1.86 GHz - NVidia GeForce 320M (can't run the beta)
PowerMac G5 Quad: OSX 10.5.8 - PPC 970MP @ 2.5 GHz - NVidia GeForce 6600
2017 Air with the beta: 360-380 FPS
2017 Air with the official 2.0.6 release: 450-470 FPS
2010 Air with the official 2.0.6 release: 510-550 FPS
PowerMac with the official 2.0.5 release & registered Emulator Enhancer 2: 330-360 FPS
Looks like the Metal renderer is giving a hit to performance.
And holy crap, why is that old Air getting the best frame rates? Is it the GPU?
To be fair to the PowerMac, it's running tons of programs right now and has CPU throttling enabled, while the Airs had nothing else running.