Subject: bug#2056: 23.0.60; Enabling flyspell degrades
performance



On Jan 30, 2009, at 4:11 AM, Agustin Martin wrote:

On Sun, Jan 25, 2009 at 11:08:14AM -0800, Ian Eure wrote:
If you enable flyspell-mode in a buffer, Emacs gets slow. Not
unbearably slow, but there's a distinct lag when you type. It seems to
get worse as the buffer gets larger.

Other people have noticed:
http://www.nabble.com/CVS-version:-message-mode-%2B-flyspell-terribly-slow-td20666831.html

That points to a thread in emacs-devel list,

http://lists.gnu.org/archive/html/emacs-devel/2008-11/msg00859.html
http://thread.gmane.org/gmane.emacs.devel/106090/focus=106118

The behavior doesn't happen on Emacs 22.

Is the same problem described there? Does disabling the tool-bar make this
slowness disappear? Note that, after above threads, some improvements were
done on this at the end of November.


I'm not sure if it is or not. I don't notice any difference with the toolbar enabled or disabled. I keep it disabled by default.

It happens with the NS port. I haven't tried GTK+ / Xaw. It doesn't seem to happen if I run Emacs in a terminal. If I launch NS Emacs, then connect to it with emacsclient, I still get the problem. It happens whether the buffer is visible on the text frame, the GUI frame, or both.

It occurs when flyspell-mode is enabled in any buffer. The major mode doesn't matter.

It recently got mush worse, to the point where I must disable flyspell in erc-mode to maintain my sanity. I suspect it was the 2009-03-14 commits to src/nsterm.m src/nsfont.m etc.

- Ian




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