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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Has eval-and-compile changed in emacs 27?
Date: Fri, 26 Feb 2021 09:54:28 +0200
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> From: Richard Stallman <rms@gnu.org>
> Date: Fri, 26 Feb 2021 01:36:52 -0500
> Cc: sdl.web@gmail.com, emacs-devel@gnu.org
> 
> It's not a good thing for a package to load more other packages
> unnecessarily.  If it happens just once, it is not a big deal.
> But if many libraries do it, it could lead to a cascade of bloat.
> 
> Does url-parse need json all the time, or only in rare special cases?

I don't see json loaded by any file in the lisp/url directory, so it
must be some indirect load.  The easiest way of finding out who loads
it would be to run Emacs under GDB with a breakpoint on Fload.