bug#2212: 23.0.90; excessive redisplay

[Marshall, Simon]

I'm currently using remote-desktop from one PC to another PC, over public broadband, where emacs is running on a Solaris box displaying on the other PC under Exceed.  As such, it's pretty obvious when there is a lot of redrawing going on because it causes noticeable flickering.

I'm seeing a lot of frame redisplay happening with the pretest.  I have Emacs open with a separate minibuffer frame, several other frames open, and when I do M-x I see all frames flickering (sometimes for ages) including the minibuffer.  At a minimum, typing M-x causes 3 or 4 redisplays of each frame before the "M-x" prompt appears in the minibuffer.

Is there an easy/quick way for me to track down what is provoking this? 

In GNU Emacs 23.0.90.1 (sparc-sun-solaris2.8, Motif Version 2.1.0)
 of 2009-02-03 on risksun2
Windowing system distributor `Hummingbird Ltd.', version 11.0.100015
configured using `configure  '--x-includes=/usr/openwin/include:/usr/dt/include:/usr/local/include:/usr/local/X11/include' '--x-libraries=/usr/openwin/lib:/usr/dt/lib:/usr/local/lib:/usr/local/X11/lib' '--with-x-toolkit=motif' '--with-jpeg=no' '--with-gif=no' '--with-tiff=no''

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: C
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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