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I've been sitting on publishing these notes for a while, because I don't want to diminish the work of the talented people that engineered SwiftUI and plowed through years of AppKit and UIKit code to get to this state. But I'd like to draw attention to some performance limitations, in the hope that a SwiftUI engineer might see this and understand pain points that might not be so obvious from their side. ...
Here I present another one, the Gonzales renderer, written by me. It is heavily inspired by PBRT and written in Swift (with a few lines in C++ to call OpenEXR and Ptex). It is optimized only as far as to be able to render it in a reasonable amount of time on a free Google Cloud instance (8 vCPUS, 64GB RAM). As far as I know this is the only renderer able to render Moana not written in C/C++. I wrote it with vi and command line Swift on Ubuntu Linux and Xcode on macOS so it should be relatively painless to get it compiled on these platforms.