Screen redraw CS4 SLOW

Many operations in CS4 are very slow compared to CS3, just a few examples:
- moving parts of an image with the move tool.
- transformations (not the final calculation, but the screen redraw while you drag the handles)
- sreen redraw while you are turning on or off layers.
That is .... anything what needs the screen to be redrawn is much slower than in CS3. OpenGl does not have any influence on that behaviour.
It LOOKS very different with OpenGL on , but "under the hood" the screen redraw is still very slow. Zooming, panning etc. with OpenGL on is very good, but as soon as the screen has to be redrawn (because the content of the picture changes)it is as slow as with OpenGL off.
So the question is:
Why is screen redraw with OpenGL OFF (!)so much slower than in CS3?
In CS3 it so fast that I can hardly follow it with the naked eye.
In CS4 I can see each tile while it is displayed. I`d say it takes about 0,5 sec for one complete screen redraw.
That slow screen redraw IMO is the reason why CS4 feels so slow.
Just compare it on your own system: turn OpenGL off and compare screen redraw to CS3. (BTW. CS3 was way slower in screen redraw than CS2, but you only see that on a slow machine).
My system is a Q6600, Geforce 8600GT with 512MB, 4G RAM, Vista 32bit.
Since screen redraw is very slow with OpenGL OFF it can`t be graphics driver problem.
Another annoyance ist the following (with OpenGL ON):
Lets assume I change something in a picture at a certain zoom level (a brush stroke, curves, a certain filter....whatever)...and then go to another zoom level (zoom in or out) then I see the picture in its previous state (that is before the brush stroke, curves.....whatever) for a fraction of a second before the screen updates. Very annoying!

Just got of the phone to Adobe Support after 1 hour of messing around and was left with the advice " put a message on the forum to let Adobe know there is a problem" Thats what I thought I had just done!!  HOUSTON WE HAVE A PROBLEM!!!
I have  a Mac Pro - Quad-Core Intel Xeon etc etc etc.... The screen re draw is woeful and the bigger the file the worse it gets. As far as fixes to prefs is concerned, been there done that. Jump though hoops with the Adobe tech and still no fix. Looks like I'm heading back to good old reliable CS3.
ADOBE SORT IT OUT.
  Model Name: Mac Pro
  Model Identifier: MacPro4,1
  Processor Name: Quad-Core Intel Xeon
  Processor Speed: 2.26 GHz
  Number Of Processors: 2
  Total Number Of Cores: 8
  L2 Cache (per core): 256 KB
  L3 Cache (per processor): 8 MB
  Memory: 6 GB
  Processor Interconnect Speed: 5.86 GT/s
  Boot ROM Version: MP41.0081.B07
  SMC Version (system): 1.39f5
  SMC Version (processor tray): 1.39f5
  Serial Number (system): YM9121BH20G
  Serial Number (processor tray): J591100L41LUC    
  Hardware UUID: 3F8619AD-9DAE-5BC2-9567-A1210DCB1DB1
Message was edited by: Merlin Man

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