I'm using a Macbook (intel) for work and a linux machine (xorg, not wayland) for hobby related stuff. It's insane how much snappier and instant everything feels on the linux machine. Every time I'm tinkering with my config on my private machine, I'm let down when using it on my work machine as I need to dial down things I've enabled because emacs has gotten really sluggish again.

I've read similar experiences from people all around the net, but my linux machine is also a bit more powerful than my macbook, but honestly not enough to explain the worlds of difference between the two.

Nevertheless, on both machines I've noticed a substantial speedup with the JIT you've mentioned, so maybe give it another try?