GNU bug report logs - #59738
c-ts-mode is slow with large buffers.

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Message #41 received at 59738 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Yuan Fu <casouri <at> gmail.com>
Cc: acm <at> muc.de, 59738 <at> debbugs.gnu.org
Subject: Re: bug#59738: c-ts-mode is slow with large buffers.
Date: Sun, 11 Dec 2022 09:25:04 +0200

> From: Yuan Fu <casouri <at> gmail.com>
> Date: Sat, 10 Dec 2022 15:14:27 -0800
> Cc: Eli Zaretskii <eliz <at> gnu.org>,
>  59738 <at> debbugs.gnu.org
> 
> Querying time (thus fontification time) increases as the buffer size increases, even if we limit the range of the query to a fixed region (which is what we do in tree-sitter font-lock). This is unlike c-mode, where fontifying a region takes the same amount of time regardless of the buffer size.

The last sentence is inaccurate: sometimes CC Mode must look far
beyond the fixed region which jit-lock.el asks it to fontify.  AFAIR,
that is mainly to figure out the syntactical context of the portion of
the buffer that needs to be fontified.

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