UX: That Square menu

Weird. The article implies that clicking the top-right Menu button on the Swipe site starts some kind of animation:

"Whoa. What! Okay, but it looks nice right? Well yes but you have to wait for the slick animation to finish; it’s a couple of seconds".

For me, it's an absolutely instant pop-up in the center of the screen. No sign of any transition or other animation, it's just there when I click.

Tested on Firefox 25.0.1 on Windows 7. Ah, the volatility of the interwebs. :)