I think it's cute how people like to shout when a browser out-does Chrome in Javascript performance but neglect to mention t hat before Chrome started making performance an issue, nobody was inclined to work on it at all.

Also, the above is true when run in VMWare Fusion... Is it still true natively? And with other game frameworks?

There shouldn't be any deal made when the latest browser performance charts come up. Every major browser maker is always trying to make their browser faster. In a short amount of time, Chrome will outperform IE 9, then vice versa. It's a constant battle for number one which benefits consumers in the long run.