Re: cc-mode fontification feels random

[Dmitry Gutov]

On 04.06.2021 14:22, Eli Zaretskii wrote:

> 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.

About a year ago, yes (bug#31138 plus some follow-ups).

With string encoding taken care of, IIUC the current bottleneck is in 
parsing: Lisp object allocation which still has to happen on the current 
thread (some way to use parallel heaps could help with that).

And to get all of the highlightings for the current buffer, we will need 
to parse the response JSON document, probably also fairly large.