I applied your diff with a testing. This indeed solved the performance
Will this be updated in Org-mode source code?
Also I come up with one thing, filter out tags which have shortcut
keybinding bound. Because user defined shortcut key defined tags are not
always on head of list.

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On Sat, May 13, 2023 at 3:39 PM Ihor Radchenko <yanta...@posteo.net> wrote:

> stardiviner <numbch...@gmail.com> writes:
> > I have a large `org-tag-alist` value that contains about ~7000 tags.
> > When I press [C-c C-q] `org-set-tags-command`. Emacs suspends a long
> time.
> Indeed. That's because `org-fast-tag-selection' tries to put all those
> 7k tags into tag selection window.
> We can probably limit the maximum number of tags in the quick selection
> window.
> Can you try the attached simple diff for `org-fast-tag-selection' and
> check if it is enough to solve the hang?
> --
> Ihor Radchenko // yantar92,
> Org mode contributor,
> Learn more about Org mode at <https://orgmode.org/>.
> Support Org development at <https://liberapay.com/org-mode>,
> or support my work at <https://liberapay.com/yantar92>

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