another impressive demo!
It works nicely on Windows XP SP2, redrawing works ok, just the clock flickers from time to time.
CPU use is around 20% by default, but I have single core CPU Sempron 64bit 3400+, which is not designed to be superfast.
I have new graphic card, GeForce 9 series, so this should not be bottleneck
Here are CPU results for various animation timings:
10ms - 99% CPU
100ms - 30% CPU
200ms - 20% CPU
400ms - 10% CPU