bug#6443: 23.2; Many files take 6-15 seconds to open after upgrade to 23.2 on WinXP

[Keith M Swartz]

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Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the bug-gnu-emacs@gnu.org mailing list,
and to the gnu.emacs.bug news group.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug.  If you can, give
a recipe starting from `emacs -Q':

---------

Upgraded from emacs 22.3 to 23.2.1 on Windows XP SP 3, using pre-built 
binaries from ftp.gnu.org. I've found that emacs is frequently 
unresponsive, would hang for several seconds during routine operations, 
including auto-save, etc. Did some searching, and found that default 
setting for w32-get-true-file-attributes had changed, so I reverted that 
back to nil -- this helped.

Now, at best, opening files takes about 1-2 seconds, which is 
acceptable. But sometimes, it still takes 6-8 seconds to open files. 
I've confirmed there is no CPU usage during this time, and Process 
Monitor does not show enough specific information to determine whether 
it's an I/O call it's hanging on, or what I/O call that is. Ctrl-G is 
unresponsive and doesn't act until after control resumes. I can 
reproduce this even with no startup files, and it happens just as often.

It APPEARED for a while that turning off font-lock-mode globally helped, 
but I think that may be a red herring. When turning it off, the first 
few file opens would usually go quickly, but after that, opening a file 
from a new location would bring back the 6-8 second hang. Not EVERY file 
opens this slowly, but enough do that it definitely interrupts the work 
flow.

All of my operations are happening locally, and not on a network drive. 
I have a network drive defined, but even when the drive is not mounted, 
the hangs still occur.

I have AV software installed, but can't disable it (due to corporate 
settings) -- however, I haven't seen this problem manifest in any other 
program, so I'm hesitant to blame that.

I am working on testing with another machine to see if I can reproduce, 
but advice on key differences to look for would be helpful.

---------

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
   `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
c:/emacs/etc/DEBUG.


In GNU Emacs 23.2.1 (i386-mingw-nt5.1.2600)
of 2010-05-08 on G41R2F1
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags 
-Ic:/xpm/include'

Important settings:
 value of $LC_ALL: nil
 value of $LC_COLLATE: nil
 value of $LC_CTYPE: nil
 value of $LC_MESSAGES: nil
 value of $LC_MONETARY: nil
 value of $LC_NUMERIC: nil
 value of $LC_TIME: nil
 value of $LANG: ENU
 value of $XMODIFIERS: nil
 locale-coding-system: cp1252
 default enable-multibyte-characters: t

Major mode: XSL

Minor modes in effect:
 display-time-mode: t
 tooltip-mode: t
 mouse-wheel-mode: t
 menu-bar-mode: t
 file-name-shadow-mode: t
 blink-cursor-mode: t
 auto-encryption-mode: t
 auto-compression-mode: t
 line-number-mode: t
 transient-mark-mode: t

Recent input:
C-c t C-x C-f C-g M-< C-n <tab> <tab> <tab> <tab> <tab>
<tab> C-n C-n C-n C-n <tab> C-u C-n C-u C-p <tab> C-n
C-x C-f M-b C-k w w w / w r i <tab> i n <tab> <return>
C-x C-f M-b C-k i d m <tab> M-b M-b C-k w o <tab> 9
<tab> <backspace> i d m <tab> 9 <tab> 7 <tab> <tab>
t x k <tab> <return> . <tab> <return> M-> M-< M-x r
e p o r t SPC e m SPC b u SPC <return>

Recent messages:
SUBTREE (NO CHILDREN)
FOLDED
SUBTREE (NO CHILDREN)
FOLDED
SUBTREE (NO CHILDREN)
FOLDED
CHILDREN
FOLDED
Making completion list... [2 times]
Mark set [2 times]

Load-path shadows:
c:/emacs/lisp/custom/css-mode hides c:/emacs/lisp/textmodes/css-mode

Features:
(shadow sort mail-extr message ecomplete rfc822 mml mml-sec password-cache
mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231 rfc2047 rfc2045 qp
ietf-drums mailabbrev nnheader gnus-util netrc mm-util mail-prsvr gmm-utils
wid-edit mailheader canlock sha1 hex-util hashcash mail-utils emacsbug
xslide-process xslide-font xslide-abbrev xslide-data etags imenu compile
comint ring xslide help-mode view html-mode jsp-html-helper-mode
asp-html-helper-mode php-html-helper-mode html-helper-mode tempo cl cl-19
cc-mode cc-fonts cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
cc-defs org-wl org-w3m org-vm org-rmail org-mhe org-mew org-irc org-jsinfo
org-infojs org-html org-exp org-exp-blocks org-agenda org-info org-gnus
org-bibtex org-bbdb time remember org-remember org-datetree org byte-opt
bytecomp byte-compile advice help-fns advice-preload org-footnote org-src
org-list org-faces org-compat org-macs easymenu time-date noutline outline
easy-mmode smtpmail sendmail regexp-opt generic-x common-fns tooltip
ediff-hook vc-hooks lisp-float-type mwheel dos-w32 disp-table ls-lisp
w32-win w32-vars tool-bar dnd fontset image fringe lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mldrag mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev loaddefs button minibuffer faces cus-face
files text-properties overlay md5 base64 format env code-pages mule custom
widget hashtable-print-readable backquote make-network-process multi-tty
emacs)