While it might not be exactly correct.. I have found that the video card refresh rate and/or the cpu speed seems to have an affect on the rotation speed. Faster the CPU/Video refresh rate the faster the panorama rotation speed regardless of value specified.
ie.. Iam using a 2.6ghz CPU and a value of .2 seems a nice graceful speed to see the panorama with out getting whip lash. While my client with a definately slower CPU speed complained it was not rotating FAST enough. So we set their rotation to .3 and they were satisfied.
I would suspect we should try an aim at a mid range speed like .2 for faster CPU's and .3 or .4 for slower CPU's . Gotta keep everyone happy.
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EasyPano - Panoweaver