I am experiencing an incredible slowness in the screen redisplay  
(fast typing results in a noticeable and annoying delay when updating  
the screen) when both of the following conditions are met:


- column-number-mode is active
- tool-bar-mode is active / the tool-bar is being displayed in the  
frame that I'm typing in.

This occurs in an Emacs 22.1 with no further options, compiled for  
Carbon and run on OS X.


I've received several bug reports on the Aquamacs mailing list  
regarding this. We have column-number-mode on by default and also  
display the tool-bar.

I've experimented with `redisplay-dont-pause' - setting it to t helps  
a bit, but Emacs is still very sluggish.

This problem does not occur on an Aquamacs Emacs compiled on 2007-04-24.