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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 20:50:50 +0300
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> From: Tuấn Anh Nguyễn <ubolonton@gmail.com>
> Date: Wed, 1 Apr 2020 00:07:27 +0700
> 
> > xdisp.c comes to mind, obviously.
> 
> On my machine, a 3.39 GHz Intel Core i7:
> 
>     (0.150791 0 0.0) ; 1 full parse

How did you submit xdisp.c to the parser?

In any case, IIUC, the first time a buffer needs to be displayed, we
need to wait for these 150 msec?  That's annoyingly long (and I
suspect in real Emacs usage will be significantly longer, due to
memory allocation, encoding, etc.).