you could try tinkering the rotation transitions with Transition Control application and see if that helps.
I changed the rotation in and out to 0 and that sped up the rotation a little (removed the animation). The display is still blank for a period of time, I need to test the other settings as well if I am able to get rid of that..

http://mobile.my-maemo.com/software/...42&fldAuto=770

(note, that I cannot remember if transitioncontrol is extras, extras-devel or extras-testing - and installing apps from devel and testing repositories might harm your device)

Hartti