Nice use of imageLens! I like this a lot. Seems like somebody should add an intelligent lazyload to timelineJS or jerusalem_maps at some point. Your project really tests the limits on that front.
I didn't get the part about lazy load - the images are pretty big, but only get loaded when you view them, isn't that what LL is about?
Chrome dev tools show a bunch of other images being loaded before the one that matters gets taken care of. (at 10s I get the image for the initial timeline point: http://cl.ly/QbZx and here is what's happening beforehand: http://cl.ly/Qbee)
Looks like this is partially thumbnails (which take a while despite their small size - not sure what's going on here) plus some larger images that aren't the first timeline point's image.