[ESS] Emacs 22 -- much less fontification ..

[Stephen Eglen]

 > >> I have also noticed that anything involving multi-line pasting is  
 > >> much
 > >> slower. For example, C-c C-n is fine, but executing a block with C-c
 > >> C-r causes a noticeable delay. On the other hand, C-c C-l is fast.
 > >
 > > I have seen similar slowness for some time on OS X running Aquamacs
 > > 0.9.9d which is based on GNU Emacs 22.0.50.1.  {same behavior on PPC
 > > and Intel, BTW}.
 > 
 > Ditto, it is super slow. I had originally just thought it to be  
 > because of my slow cpu (Carbon Emacs, PPC, Mac OS X)
 > 

Regarding the slowness in C-c C-r, does the following improve matters:
  (setq ess-eval-visibly-p nil)

Stephen