When moving the separator bars/sliders between the docked windows/panes, you'll have a terrible experience. Same thing when trying to dock a floatable window.

Workaround?

Go to the Compatibility tab in the properties of DevEnv.exe and check the Disable display scaling on high DPI settings checkbox. Voilà.

I’ve been told that there won’t be any need to do this by the time we release Vista.

Voici venir le Barbapapas...