Well, Mac users, don’t get too excited yet.  Adobe still hasn’t enabled GPU acceleration on the Mac version.  In fact, GPU acceleration has only been enabled on recent models of NVIDIA GPUs on Windows (where it is showing some major improvements on machines like ION netbooks).   It isn’t all bad news – the release is still worth trying out.  There was still some quality improvement from yesterday’s 1080P Youtube test – notably fewer dropped frames.  However, the CPU still red-lined on a new MacBook Pro 2.26GHZ, 4GB RAM:

Interestingly, using ClicktoFlash’s Quicktime(MP4) option showed almost no CPU usage while playing the file at the same resolution.  This shows what can be done with offloading the heavy lifting to the GPU.  By they way, if you aren’t using ClicktoFlash by now, you are nuts.

Not enough?  AnandTech has more information than you’d ever want on the matter.