I have a 2015 iMac, with a 27 inch screen. As far as the screen is small (1200x1200px max-ish), Darktable is relatively fast to display, move the image in the darkroom. Even the interface is more responsive.
Full screen (5120 × 2880), redrawing and “working…” takes several second for exposure compensation for example. Button highlights areless responsive and often stays “on”, forgetting be switch to off (the function is off, only the button stays on).
On an M1 macbook pro (using rosetta 2), Darktable is a bit better, but I guess it’s because the screen is quite small (13 inch)
On a more global note, I noticed GTK based applications are slower than Qt based applications. There is definitely a big difference of support on macos (who ever is in charge).