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put-text-property slowness

From: Karl Chen
Subject: put-text-property slowness
Date: Wed, 22 Mar 2006 21:26:46 -0800

When font-lock-support-mode is nil, dired with dired+ takes way
too long on large directories: on the order of many minutes; if I
set font-lock-support-mode to 'jit-lock-mode, then it takes less
than half a second.

So there's an easy workaround but it wasn't easy to find.  From
casual profiling, the issue seems to be the thousands of
`put-text-property' calls in `insert-directory'.

Steps to reproduce:

wget http://www.emacswiki.org/cgi-bin/wiki/dired+.el/download/dired+.el

[add directory containing dired+.el to load-path]

emacs -q

(require 'dired+)
(setq font-lock-support-mode nil)
(dired "/usr/bin")

Karl 2006-03-22 20:03

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