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> but at least the UI it's miles ahead on responsiveness.

One Lisp REPL doing stuff and GNU Emacs is completely dead as long as the Lisp REPL runs that Emacs Lisp code. It's not even slow, it just is completely non-responsive.

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This seems a bug in the design of that REPL. Unless there's some reason the process has to be the same as the editor process.

I want multiple Lisp REPLs which run Lisp code concurrently in the same Lisp process.

How would I do it in GNU Emacs?

The first question is why. Can you not use CL repls instead of elisp repls?

I would want to hack Emacs Lisp, not Common Lisp.

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