simple cube grid animation

i’m testing blender 2.5a2.
some of the keys are different…

here’s an interrupted animation i made in 2.5a2:
http://www.youtube.com/watch?v=abTWmQPIlAY

version 2
825 frames, renderd to aviraw(4.6GB) then transcoded to .webm(2.77MB)

http://www.youtube.com/watch?v=O7-mA-rPx10

why is rendering in the 64bit linux version 4 times faster then the win7 64bit version?