30fps or above is good, but it's strange some of the framerates people are reporting.

I've tested this demo on an ancient AMD Sempron, 1.6 ghz, with 512 megs of RAM, and it runs at a near constant 60fps, with the occasional dip to 50 something.

The CPU in your netbook is almost as fast as a 1.6 ghz AMD Sempron, I would have thought you'd get around 50fps at least. Unless you're using Chrome.