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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Run `M-x list-input-methods` and then scroll down the screen in
 input method panel using the mouse or arrow key will cause Emacs
 unresponsive for about 1 minite.
Date: Sat, 19 Jun 2021 09:13:56 +0300
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Cc: Emacs-devel@gnu.org
To: Hongyi Zhao <hongyi.zhao@gmail.com>
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 (message from Hongyi Zhao on Sat, 19 Jun 2021 13:05:57 +0800)
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[Please don't cross-post here and in help-gnu-emacs, choose just one.]

> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Sat, 19 Jun 2021 13:05:57 +0800
> 
> I noticed the following strange problem:
> 
> First start Emacs like this:
> 
> $ /usr/local/bin/emacs -Q
> 
> Then run `M-x list-input-methods` and scroll down the screen in input
> method panel using the mouse or arrow key will cause Emacs
> unresponsive for about 1 minute.

It isn't necessarily strange: Emacs looks for the fonts needed to
display the relevant characters, so if you have a lot of fonts
installed, and some character is not supported, it will take Emacs a
lot of time to scan all those fonts.