I like the interface on RT better than Darktable, but man, RT is dog slow on a Mac. I have a pretty beefy iMac, but scrolling through photos is just too slow. Darktable's noticeably better in that, but honestly, there's some quirks and bugs with interfaces that make it hard to use. It isn't as quick as a native app, and zooming/scrolling is stupidly sensitive with a Magic Mouse. I understand a lot of these performance issues are GTK 3 and below issues.

I fully tried to transition to one of those, but at the end of the day, I went back to Aperture running under Retroactive. It's probably not a long term solution, but hopefully by the time it does finally break for good, GTK 4 would have been adopted by more and more apps.