Jumpy animation in papervision

Can you please check the link bellow:
http://www.tempotech.ca/test/2/ - as you can see animation is jumpy/jittery
but when I remove materials I get nice smooth animation:
http://www.tempotech.ca/test/1/
do you have idea why is this happening??? Material is simple 150x150 pixel jpg image.

Have you tried it with less blocks? I’d say it’s just too much for the flash player to handle. Does moving the camera backwards (so everything is smaller) make a difference?

Maybe the textures are huge bitmaps like 2000 x 2000 ?

I have turned smoothing off, now it works perfectly.