onmousemove unresponsive in complex rendering

The following code is based on your own demo for csg.
It builds an atomium like structure in a view and a simple sphere in another.
Using Chrome 15 (although building the model is very slow, it works in Firefox 8), dragging the mouse is ineffective in the first (atomium) canvas, whereas it is still responsive in the test canvas.
http://pastebin.com/yaFmC4bw
(couldnt manage to format whole code properly)