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

[Peter Tury]

2006/10/12, Eli Zaretskii <address@hidden>:
> > Date: Wed, 11 Oct 2006 22:54:05 +0200
> > From: "Peter Tury" <address@hidden>
> >
> > Now I've tried emacs.exe -Q; then opening the 1MB file: it's fine (1-2
> > seconds), but fundamental mode was used. In this running "pure" emacs
> > I loaded the files for the specific mode support for this source file,
> > and tried opening again: it still fast enough (2-3 secs). So that mode
> > itself seems to be OK, but something else slows down emacs.
> >
> > I also tried emacs.exe (so no -Q was used) just to verify if
> > gnuclientw is wrong. Emacs.exe is similarly slow as gnuclientw.exe.
> >
> > Let me emphasize again that the same .emacs with older EmacsW32 is
> > fast, so something is changed in these newer Emacses what results slow
> > down -- if I use my .emacs ...
>
> We need 2 things to investigate this:
>
>  . a clear recipe to reproduce the problem
>  . some understanding what customizations in your .emacs cause the
>   problem
>
> For the latter, please selectively disable portions of your .emacs
> until you arrive at the minimal self-contained portion that causes the
> slowdown.  Then post that portion (together with a precise recipe to
> reproduce the problem) here.

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?

Thanks,
P