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How well EXWM performs nowadays?

IME the same of yesterday, I mean it’s a WM, no special compiz/beryll alike effects or so…

Is it resource heavy compared to other tiling window managers?

EXWM run on top of Emacs, so definitively it demand more resources than an X standalone WM, but itself it’s very light. The point of EXWM is living in Emacs, it’s a nonsense choosing it for just the WM.

Is it still an issue EXWM not being multi-threaded?

Generally speaking yes, but no. Normally you have to do nothing blocking so there is no issue. RARELY I experience something but it’s honestly not a problem and the ability to have my X11 stuff in Emacs it’s so much powerful that I do not want to switch to anything else…