Very nice indeed.

In the Resource Timeline, when hovering, it would be nice to have the exact millisecs in addition to the existing proportional colored rectangles. The absolute total time could be added on the black hovering div on the left.

Thanks to the tool I discovered that the DNS time of my domains was far from perfect, thanks! (my host in on amazon EC2 west, but my DNS is french Gandi.net...)

Also nice would be the performance on reload (ie with a hot cache instead of a cold one).