I'm not sure where is appropriate for this thread so I just guessed (feel free to move it). I did the HTML5 speed test on my MBP running Safari 5.0.5 and I only got 3 FPS. Really lame...I'll post the link in the post so you can test yours and post your results. This is the speed reading link on the Microsoft site and it's a direct link.
HTML5 Speed Reading
HTML5 Speed Reading