Re: cc-mode fontification feels random

[Eli Zaretskii]

> From: João Távora <joaotavora@gmail.com>
> Date: Fri, 4 Jun 2021 12:05:18 +0100
> Cc: Eli Zaretskii <eliz@gnu.org>, ubolonton@gmail.com, 
>       Daniel Colascione <dancol@dancol.org>, theo@thornhill.no, emacs-devel 
> <emacs-devel@gnu.org>
> 
> > > The communication of buffer contents to these agents/servers is indeed
> > > one aspect of the existing packages (those I had time to look at) that
> > > I personally am unhappy about.  Sending the whole buffer or its large
> > > chunks down the wire as buffer-substring (which requires encoding to
> > > be correct) is non-scalable, especially if it also requires conversion
> > > to JSON.
> >
> > How bad is is actually; are there good numbers on this?
> 
> Not from me.  Only gut feeling.  But I have seen latency from servers before.
> That just depends on the server and its architecture, I guess.
> 
>  However there are reports of enormous latency on Emacs side when JSON
> messages get very long and complex. Part of this related simply to JSON
> parsing and allocation of lots of lisp objects.  My hunch is that
> fontification of
> a big and complex buffer would give rise to one of these big and complex
> JSON messages.

Ask Dmitry about performance problems with native JSON support, and
the effort we invested (a year ago?) into optimizing UTF-8 encoding of
strings, to squeeze every last percent of performance.