It displayed fast here. No delay at all. I do have a pretty decent system though so maybe it's just a horsepower issue for slower systems?
Certainly not (only) horsepower issue, when other browsers and especially Chrome do not suffer. There must be some (unneeded or badly implemented) internal operation outside page rendering (can be related to displaying url box - of course I can't know, just guess), which locks interface up for some tens of precious milliseconds.