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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: jit-lock-antiblink-grace
Date: Sat, 12 Oct 2019 20:50:52 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: joaotavora@gmail.com,  emacs-devel@gnu.org
> Date: Sat, 12 Oct 2019 13:16:45 -0400
> 
> >> AFAICT the code doesn't call font-lock.
> > It adds a timer that does.
> 
> AFAICT this only runs code which has been delayed (i.e. it would have
> been run earlier if it weren't for this feature), so it's "no worse".
> 
> And it's an idle-timer run after 2s of idle time, so impact on
> responsiveness should be minimal even in the worst case.

Idle timers that run expensive code make Emacs feel very unresponsive.
That's one reason why we introduced JIT lock, many years ago.