Hi maintainers,

To reproduce, I evaluated these in the scratch buffer.

    (defun sayhi (&rest _)
      (while-no-input
        (dotimes (_ 10000000)
          (random)))
      (message "Done."))

    (add-hook 'post-command-hook 'sayhi)

After `C-x C-e`-ing the last line, I kept typing some arbitrary text at a
normal speed.

With `emacs -Q -nw`, the last character shows up pretty much immediately
after the new key is pressed (as I expect). In GUI, however, there is
significant delay. Say if I type "hello world", then maybe "h" and "e"
would show up, then nothing happens for a few seconds, then the rest would
"burst out".

I'm not sure if this is considered a "bug", so sorry if this isn't the
right place to report this. But after looking at documentation and a few
other bug reports, it sounds like people expect `while-no-input' to work in
this scenario? Also I see completion packages like Corfu and Vertico wrap
things in this macro in the post-command-hook, and despite them doing that,
auto-completion is still quite laggy for me, _only_ when in GUI. If this is
not a bug, where should I submit a feature request?

Either way, thanks for your time.

Allen

---

In GNU Emacs 30.0.50 (build 1, x86_64-apple-darwin18.7.0, NS
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