"Photorealistic" is a big, big stretch here. Why is the shadow the colour of the object that is shadowing it? Why doesn't the softness of the shadow relate to the distance to the light source? Why don't adjacent objects affect each other shadow colours? Also, the inset shadow doesn't seem to work - the cursor can hover directly over shadow area.<p>It mostly seems to be a css shape-repeater to give a 'shadow-like' visual appearance in a dynamic direction.<p>I mean, I'm not trying to put down the writers js/css skills, but when I read "Photorealistic shadows", I think of something like LuxRender. So, probably, just marketing skills.
Well I didn't <i>notice</i> any performance issues, but based on the other comment I checked out perfmon, and yeah, its pegging a core.<p>Maybe less sprites on the demo page?