I've installed FlatHub originating FreeCAD 0.21.2 from "Software" app (very AppleStore like experience minus the signing in). It spinns up in cca 10 seconds. I've opened the "ArchDetail" demo example it offers, after discovering the "Gesture" option in the bottom right corner I can rotate and zoom the model freely using fingers with no impact on performance - no matter how quickly I "twich" with the model I can't get more than 30% CPU load spike, maybe 25% ( Fedora39 default Gnome3 windowing, CPU scaling on "power saver").
The CPU/performance IMO feels really good and not what I would expect from Intel CPUs. 1.1 GHz Base Freqency, 3.1Ghz Burst (single core I believe), some Intel graphics that can take Gnome 3 "zooming windows" with perfect fluency and all that in cca 5 Watts and no fan. The performance feels an order of magnitude better than what RPi3 would provide IMO.