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Just noticed this post so don';t know if it is still valid/outstanding, probably not. Still, I had a similar problem and was advised to add the config option
gct_enabled no
This is a hidded config option but has sorted my problems completely.
Mark,
This is an issue with your Graphics Driver software version. We had this issue when using the latest NVidia driver and had to go back to a previous version of the driver to eliminate the slow and choppy behavior in Drawing mode. I have not tried the latest driver to see if it is fixed but try different versions and see if that helps. Our issue was on x64 XP so I don't know which will work best with Vista.
David