And it only uses 61% of both my 3.0GHz cores.
But it doesn’t beachball and it doesn’t crash. Flash is the only piece of software I use that crashes constantly. As in nearly every day. Compared to once, twice or even as much as – gasp! – a dozen times per year when using all that other stuff I use. It’s disruptive. It’s annoying. More so than spinning fans. That’s a minor annoyance compared to the crashes.
In theory though, it should be much easier to fix a couple of crashes than to increase the performance of JS + canvas, say, an order of magnitude.