Vista desktop acceleration

Do you get GDI acceleration in vista?
I'm wondering if something's messed up on my end or if Microsoft decided that the hw-accelerated presentation of the rendered window is enough.
An easy way to test this is to have a reasonable screen resolution (1600x1200 or so), open notepad and resize it to cover almost the entire screen. If GDI isn't accelerated you'll notice that it's slow to resize the notepad window (compared to winxp).

>>1
http://en.wikipedia.org/wiki/Graphics_Device_Interface . search for vista on that page

>>10
it's not a matter of portability. directx wasn't designed to work with opengl simultaneously. running an opengl and a directx app at the same time greatly degrades the performance of the whole system. since aero uses directx, running a opengl app would make the system unusable. this problem was solved by translating opengl function calls to directx function calls. the performance overhead is minimal but it does exist.

the whole opengl-translated-to-directx-in-windows is no different to directx being translated to opengl in wine or cedega. people report minimal performance loss when running a directx game under wine in linux (assuming the game operates correctly under wine).