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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Reliable after-change-functions (via: Using incremental parsing
 in Emacs)
Date: Tue, 31 Mar 2020 22:29:02 +0300
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> From: 조성빈 <pcr910303@icloud.com>
> Date: Wed, 1 Apr 2020 03:42:31 +0900
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, casouri@gmail.com,
>  akrl@sdf.org, Emacs-devel@gnu.org
> 
> > One second of delay before the first window-full is displayed?  This
> > is like infinity.
> 
> Maybe I misunderstood, or maybe it’s just b.c. I don’t know enough internals, but doesn’t Emacs just display the raw text until highlighting is finished?

I guess you are talking about jit-lock-defer-time and friends.  That's
off by default.  The default behavior is to fontify completely the
chunk that is about to be displayed (actually, we fontify slightly
more than that).