Just a test for those with dual processors.

I've just been doing an experiment and just wanted to see if anyone can see the same results as me.

http://www.fatal-exception.co.uk/test/Test.swf
It will take a while to appear and will look weird but that's completely unimportant. Weirdly enough it seems to work much better on Firefox and Mozilla than IE(which is using Flash 10)

When I run that SWF on my laptop, it runs at about 40% of the CPU's power, but not equally for each core. It runs on about 50% on one core and 25% on the other.
If I run it through Flex (what I built it with) it's even weirder. It runs at 80% on one core and about 15% on the other. The core it uses to do the bulk of the work alternates too (perhaps because one is getting hot or something???).

Is this simply normal behaviour for Windows machines? Does anyone else with a dual core machine see the unequal CPU usage?