I had a small experiment to figure out which 3D engine works best on a project.
First I made an XML file with lots of random Lorem Ipsum sentences (299 words), load the XML, and place the words randomly on the 3D space.
It turns out to be, CS4 works the best and the next is Away3D for Flash Player 10, and the last is Papervision3D.
Not a big surprise with the result of Papervision3D as Papervision3D hasn't released their Flash Player 10 version yet.
Wish to see how much the performance will be improved when Papervision3D releases its Flash Player 10 version, PapervisionX.
Check out the links below to see the files that used for this test.
CS4: http://works.harolee.com/Tests/as3_3d_engines/cs4/
Papervision3D: http://works.harolee.com/Tests/as3_3d_engines/pv3d/
Away3D: http://works.harolee.com/Tests/as3_3d_engines/away3d/