GNU bug report logs - #48841
fido-mode is slower than ido-mode with similar settings

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Eli Zaretskii <eliz <at> gnu.org>, Daniel Mendler <mail <at> daniel-mendler.de>
Cc: larsi <at> gnus.org, 47711 <at> debbugs.gnu.org, joaotavora <at> gmail.com, 48841 <at> debbugs.gnu.org, monnier <at> iro.umontreal.ca
Subject: bug#48841: bug#47711: bug#48841: bug#47711: [PATCH VERSION 2] Add new `completion-filter-completions` API and deferred highlighting
Date: Mon, 16 Aug 2021 17:00:09 +0300

On 16.08.2021 16:21, Eli Zaretskii wrote:

>>> FWIW, I also don't understand how adding properties could cause a
>>> memory leak.  When a string is GCed, its properties get GCed as well,
>>> all of them.  Am I missing something?
>>
>> If you add string properties to all symbol names this memory will stay
>> alive for much longer than necessary.
> 
> That's a very extreme example, something that I wouldn't expect a Lisp
> program to do, without removing the properties shortly thereafter.

And that *will* happen with Joao's approach, as soon as some package 
implements a Lisp completion backend in a certain (legal) fashion.

Or using one of a few different fashions, actually.

> And even that isn't a leak.
> 
> Note that we already put all kind of properties (although not text
> properties) on symbols.

Those do not, generally, change over time.

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