Pretty much the ultimate test for any JS engine is this website.  The stars above are pretty hardcore (there’s a lot of them, and the code isn’t optimized).  Google Chrome is impressively fast (but so is Safari), but the rendering of the stars looks a bit odd.  Are there PNG/opacity problems perhaps?

Update:  yes, there are.  Chrome uses a new drawing engine, and it doesn’t work.  Also, translucent text doesn’t anti-alias properly (check out the BBC News website – the Accessibility link is humourously unreadable, while the rest of the site is fine).

It is quick though.  Another good test of the browser is my Easter card.  http://www.kufluk.com/easter/
I’ve added a larger number of bunnies than usual, and the JS is fine!  Sadly, the animated GIFs are causing trouble though.