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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How to debug memory leaks
Date: Fri, 26 Mar 2021 18:02:02 +0300
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 (message from Arthur Miller on Fri, 26 Mar 2021 15:57:09 +0100)
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> From: Arthur Miller <arthur.miller@live.com>
> Date: Fri, 26 Mar 2021 15:57:09 +0100
> Cc: help-gnu-emacs@gnu.org
> 
> Would there be any way for Emacs to unload unused fonts? GC?

We already do that.

> As a thought, could it be possible to implement something like "clean
> emacs state" or/and "clean buffer state". It would throw away undo
> history, unload unused stuff, for example in eshell/term/ansi-term kill
> the buffer text, etc. Something that would work either on entire Emacs state,
> or just on a buffer state; or maybe on both.

That's what GC does.