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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel,gmane.emacs.gnus.general
Subject: Re: Rendering regression in Gnus with gnus-treat-from-gravatar
Date: Wed, 15 Apr 2020 14:38:15 +0300
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> From: Robert Pluim <rpluim@gmail.com>
> Cc: asjo@koldfront.dk,  ding@gnus.org,  emacs-devel@gnu.org
> Date: Wed, 15 Apr 2020 12:13:24 +0200
> 
> As an aside, emacs threading seems very unresponsive, in that it
> appears to take a very long time after the thread has been started
> before it reacts to the signaling of the condition variable. I was
> assuming I didnʼt need to explicitly yield from the main thread
> after that, but perhaps I do?

The thread will not run until the main thread yields in some way.
What does the main thread do after calling make-thread?