put-text-property slowness

[Karl Chen]

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