Hi folks, I'm one of the developers of this project -- we hear your perf concerns loud and clear and are tracking the issues :)
As mentioned elsewhere in this thread, this page was released a little too early while we were still playing around with animations in the header. I've gone ahead and disabled them for now, so you should see leaner CPU utilization now. Thanks for your comments.
Even now, it's still pretty sluggish, all around. My machine is, I think, as big as can be expected (current gen i7, 16GB), though I am on a slow 4G network. But, as others note, it is gorgeous, and the API appears well thought-out, and very complete (or, at least, complete for the kinds of systems UIs I build).
There still seems to be some display issues on the header, this is how it looks like on my phone: http://oi64.tinypic.com/125miwj.jpg (and it's blinking).
As mentioned elsewhere in this thread, this page was released a little too early while we were still playing around with animations in the header. I've gone ahead and disabled them for now, so you should see leaner CPU utilization now. Thanks for your comments.