I'm on a Windows machine right now (ugh), and only Safari 5 renders it absolutely smoothly. Chrome and Firefox (latest versions) fail miserably (Chrome is something like 15 fps with a 500 ms lag at the beginning, Firefox at 20 fps).
This is the first time I've seen Chrome performing worse than Safari on Windows (they're usually on par, with Chrome a little better sometimes).
More info in case it's useful to OP: Windows Vista, latest service pack I presume. 2.53 Core 2 Duo, a 4 year old graphics card (quite good for its day, but naturally not so hot these days), 4 or 5 gigs of RAM.
This is the first time I've seen Chrome performing worse than Safari on Windows (they're usually on par, with Chrome a little better sometimes).
More info in case it's useful to OP: Windows Vista, latest service pack I presume. 2.53 Core 2 Duo, a 4 year old graphics card (quite good for its day, but naturally not so hot these days), 4 or 5 gigs of RAM.