GNU bug report logs - #44983
Truncate long lines of grep output

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From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 44983 <at> debbugs.gnu.org, Dmitry Gutov <dgutov <at> yandex.ru>
Subject: bug#44983: Truncate long lines of grep output
Date: Tue, 01 Dec 2020 22:35:55 +0200

>> Perhaps (setq truncate-lines t) could help in that case?
>
> Not necessarily, because the truncated parts are still in the buffer,
> and the display code which is slow in that case basically moves
> through the buffer one character at a time in many cases.  Only some
> specific scenarios (read: a small number of commands) can jump to the
> next physical line disregarding the truncated parts.

It's very strange that after adding the text property 'display "[…]"
on a very long line, motion commands are still very slow in that buffer.

Could you help to understand why hiding long regions
doesn't help to improve performance?

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