bug#36566: 27.0.50; debug is sometimes horribly slow

[Gemini Lasswell]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Skimming this bug report, it's not immediately clear to me what the
> remaining performance problems were.  Does anybody have a simple test
> case that illustrates the problem (if, indeed, it's still present in the
> current Emacs -- this was two years ago).

I followed these steps, found in one of my emails from two years ago,
using Emacs 28 downloaded from my distro and launched with '-Q', and a
bigger org file of about 250K, cause that's what I had handy:

Navigate to org-export--prune-tree in ox.el.
C-M-x to instrument it with Edebug.
Open a 150K org-mode file.
C-c C-e h H
Press Space repeatedly to step with Edebug

Result: stepping over any evaluation of the variable  `data` takes a few
seconds.

Two years ago I called Edebug "very sluggish" in these circumstances but
I would not call it that today, so I think you can go ahead and close
this.