bug#233: Slow repainting, sluggish feeling emacs

[David]

I recently re-built emacs 23 from cvs and there's a noticeable delay in many repainting operations. Typing is sluggish and redrawing a buffer when switching to it is noticeably slow.  

So I tried to measure the difference.  I started two versions of emacs with --no-init, loaded nothing, and immediately ran elp-instrument-function on "ibuffer".  Here are the results: 

emacs(GNU Emacs MailScanner warning: numerical links are often malicious: 23.0.60.1 (i386-mingw-nt5.1.2600) of 2008-02-20 on U0103223-XPA)
Function Name Call Count Elapsed Time Average Time
ibuffer        1           0.0           0.0


GNU Emacs MailScanner warning: numerical links are often malicious: 23.0.60.1 (i386-mingw-nt5.1.2600) of 2008-05-12 on U0103223-XPA
Function Name Call Count Elapsed Time Average Time
ibuffer        1           0.032         0.032

I ran elp-instrument-function again and got:
ibuffer        1           0.047         0.047

The time difference is very small, but with a loaded up emacs config the time becomes very noticeable. 
I built emacs on windows-xp using cygwin(-mno-cygwin however), ming32-make.  Both versions of the build where 'configured' the same: 

Here's the 'report-emacs-bug' important stuff:


In GNU Emacs MailScanner warning: numerical links are often malicious: 23.0.60.1 (i386-mingw-nt5.1.2600)
 of 2008-05-12 on U0103223-XPA
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --cflags -I../../include -msse3 -O3'

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: Fundamental

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x M-p i <backspace> e l p 0 <backspace> - i n s t 
r <tab> f u n <tab> <return> i b u f f e r <return> 
M-x l o a d - l i <tab> <return> i b u f f e r <return> 
M-x M-p M-p <return> M-p <return> M-x i b u f f e r 
<return> q C-x b C-g C-x C-b <down> <down> <down> <down> 
<down> <down> q C-x 1 M-x i b u f f e r - <M-backspace> 
e l p - r e s u l <tab> <return> C-SPC <down> M-w q 
M-x r e p o r <tab> <return>

Recent messages:
goto-history-element: Beginning of history; no preceding item
elp-instrument-function: ELP cannot profile autoloaded function: ibuffer
Loading ibuffer...done
Updating buffer list...
Formats have changed, recompiling...done
Mark set
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help
Quit
Mark set