Re: Fwd: Serious performace problems on Windows XP with new(!) GNU Emacs v22 (both patched and unpatched EmacsW32 were tried)

[Peter Tury]

2006/10/18, Eli Zaretskii <address@hidden>:
> > Date: Tue, 17 Oct 2006 23:00:34 +0200
> > From: "Peter Tury" <address@hidden>
> > Cc: address@hidden
> >
> > It seems whitespace-buffer slows down my Emacs so terribly: my .emacs
> > sets whitespace-global-mode with its all bells and whistles....
> > finally I found that if I M-x whitespace-buffer with my critical file
> > opened in the buffer (regardless of whitespace-global-mode setting) I
> > get back the control after that long time what I wrote last time.
> >
> > I tried to modify whitespace-buffer and it seems that
> > whitespace-buffer-search is so slow. However I see that it is not
> > really modified between the fast (old) and slow (new) Emacses... and
> > does almost only a re-search-forward. Now I don't have the C sources
> > for both (fast and slow) Emacses. Maybe re-search-forward was
> > modified?
> >
> > Can you help based on these info or shall I try to build a test file
> > (what is so slow with whitespace-buffer) and send it to you?
>
> It's best if you post the file, thanks.

OK. Here is my receipt:

1. start CVS Emacs with -Q (I used unpatched EmacsW32 of 2006-10-11)
2. in *scratch* eval-last-sexp (load "whitespace.el")
3. unzip and then visit the attached slowtst.el (I drag&dropped it)
4. M-x whitespace-buffer: it took ~20-25 seconds for me! (I have a
1GHz AMD processor; if you have a too good :-) one then copy-paste
slowtst.el's content a few times to make it big enough)

Thanks for your help,
P

slowtst.zip
Description: Zip archive