GNU bug report logs - #58687
29.0.50; Enabling pp-use-max-width dramatically slows down formatting of large sexps like org-persist--index

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Message #17 received at 58687 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Ihor Radchenko <yantar92 <at> posteo.net>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 58687 <at> debbugs.gnu.org,
 m.eliachevitch <at> posteo.de
Subject: Re: bug#58687: 29.0.50; Enabling pp-use-max-width dramatically
 slows down formatting of large sexps like org-persist--index
Date: Thu, 12 Jan 2023 22:03:50 +0530

[வியாழன் ஜனவரி 12, 2023] Ihor Radchenko wrote:

> [...]
> So, the current `pp' implementation is re-parsing from bob for every
> nested list inside sexp. This is quadratic scaling, and, as the repro
> demonstrates, the time goes up very quickly. Is the new option usable
> at all in practice?

IME, unfortunately not.  Like the OP, I saw the announcement of the new
user option, got excited and enabled it right away... only to be hit by
bugs more often than not, add to it the slowness, it wasn't a fun
experience.
Personally, I always thought it would be best if the user facing
commands like pp-eval-sexp and friends alone respected the user option.

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