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Re: State of the overlay tree branch?

From: Stefan Monnier
Subject: Re: State of the overlay tree branch?
Date: Mon, 19 Mar 2018 10:56:30 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> well no, it's about 2.5ms per call to line-number-at-pos, which is called at
> least 6 times per character insertion (with my Emacs config, at
> least). Which already makes for 15ms per character insertion, excluding
> anything else done by cc-mode or lsp-mode.

Since you say that the noverlay branch helps, could you check the number
of overlays involved?  E.g.

    M-: (length (overlays-in (point-min) (point-max))) RET

If there are more overlays than chars in this buffer, maybe there's
a problem in some Elisp that creates too many overlays?

If there aren't that many overlays, then I wonder why the noverlays
branch would make such a significant difference.

Also, if you can reliably reproduce the "slow editing", would it be
possible to make a recipe for it that we can try and reproduce on
our side?


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