What's the best (most efficient) lazy image loading method out there?

I've found this which looks pretty cool:

http://ift.tt/ROhyJf

Not sure if it's good or bad, maybe you know something?

Epic visual tool

Epson 5030UB 2D/3D 1080p 3LCD Projector Submitted November 04, 2015 at 05:31PM by typehead http://ift.tt/20upHrB