Hi inZOI team!
Let me be frank: I don’t know what aspects of porting the game to MacOS decide if a developer implements MetalFX upscaling well or poorly. All I know is that other titles are doing it far better than inZOI.
I know, the game is still in progress. But the visuals at a 4K resolution with MetalFX set to Performance are just kinda unacceptable.
Since I’m playing in a high native resolution, I always go for Performance mode, since it allows for the best well… performance 
and if implemented well doesn’t scare you with visible pixels.
No Man’s Sky, Lies of P, Cronos The New Dawn, Control, Cyberpunk 2077, Resident Evil games, all of those titles implemented MetalFX far better, even on said Performance preset.
And if you want to tell me “just play natively” or “use Quality preset” I can’t. The game’s optimisation overall is very lacklustre, so it doesn’t really work that great without MetalFX Performance.
I sure hope you’ll take time to optimise the game itself and the Performance preset for MetalFX in the future!
Thanks for all the hard work!