Jon Simpson
Official Gmail Blog: Fast new windows
Unfortunately, we weren’t able to make this work in Internet Explorer, so to see the speed-up, you’ll need to be using Mozilla Firefox, Apple’s Safari, or Google Chrome.
The Gmail ‘Loading…’ progress bar when popping out a window had been quite annoying, so it’s nice to see it gone. Interesting to see Google providing a better experience for non-IE users, I wonder if this is aimed at putting pressure on Microsoft to add support for the underlying implementation features in IE.