High CPU usage has been a massive ongoing problem for me in both mobile and desktop app development (see Mobile App Builder freezes when deleting components). I've gone through every page of my app and removed zombie components, converted large transformers to queries, and removed all list components (which in practice function as unquenchable compute vampires), and though those changes massively improved editor performance, I'm still dealing with sporadic high CPU usage that brings the editor to a halt.
And yes, this happens on both my at-home and in-office hardware, both of which are Macbook Pros of 2023 vintage or newer.