RE: emacs rendering comparisson between emacs23 and emacs26.3

[Drew Adams]

> Whether this is "bad" depends on what you use the fontification for.
> For me, it's a sign of syntax correctness (among other things), so
> waiting for the confirmation of the syntax for such a relatively long
> time is quite "bad".

I don't mean to distract from the discussion.

But what you say there seems useful to me: syntax
highlighting can serve more than one purpose.

Given that, could one solution/approach perhaps be
to let users choose (e.g. by variable, possibly
buffer-local) the behavior they want in this regard?

For example, some users, or users in some contexts
(e.g. some modes), might prefer to sacrifice some
degree of fidelity (correctness) between syntax and
fontification, if that provides better performance
in those contexts.

Again, if this question/comment is a distraction,
feel free to ignore.