"It's easy to see in the chart above what an incredible difference Flash 10.1 makes! With Flash 10.0, SD played smoothly, while 720P lost a barely noticeable number of frames and 1080P played terribly, bogging down the entire computer so much that Internet Explorer locked up and the process had to be killed in Task Manager. Firefox had a similar locking result, though it did eventually respond on its own. A credit to Google's Chrome sandboxing approach, closing out the browser was immediate even if the video playback was the worst..."
Check it out at Legit Reviews.