I had a quick peek at the profiler in Safari when you drag the model around, and the CPU on my machine is spiking at more than 100%, with 58% of the load being

I had a quick peek at the profiler in Safari when you drag the model around, and the CPU on my machine is spiking at more than 100%, with 58% of the load being style recalculation. I suspect something in Chrome is hardware accelerated that isn't in Safari.