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Of all the problems Guile Emacs might have fixed, performance on Windows is not one I considered.

I don't know if it would, but I can imagine that replacing the aging Elisp interpreter would improve the situation on all systems.

Yeah but does guile even work on windows? Last time I checked it was still very much confined to *nix systems.

Guile probably would, but Guile Emacs is not ready (yet?).