I've been writing some automation scripts using autoit and the script goes through control panel items switching things on and of. I had the two operating systems running virtualized. It was just interesting seeing how the two systems react. The control panel items in XP are way snappier. The windows/dialogs come up fast and their is hardly any delay. The control panel items in Vista use a more webby type interface (I don't know what to call it). They are slow and seem harder to navigate.
Its a subtle difference. But perhaps shows why people might not be happy with Vista. Its these little things that pile up to create an annoying experience. Why is such a simple thing as drawing a control panel item so slow in Vista?