I'm trying Aalto 1.9.2 on 2019 15" MBP (2.4GHz i9, 32GB RAM) under macOS 10.14.6 / Ableton Live 10.1.5.
What I've noticed is that while the Aalto GUI is visible for a patch like 'Delayed Ghosts' the Live process CPU locks to about 150% with nothing else going on (not actually playing any notes).
However, if I move the UI from the 15" display onto a secondary display (Dell U2412M), CPU use halves.
Any idea what's going on?
There's an option in the settings (gear) menu for turning off UI animations. Hopefully this will help.
The dials animating eat up a bunch of CPU on your Retina display because of software drawing and copying at the high resolution.
That's what I think is going on anyway.