Image compression (again)

It's not the most exciting thing to have happened to web performance in the past year or so - but it will have an impact on your performance and scalability. A team from Google have released a new JPEG compressor called guetzli. 

What's interesting about this one, is that the team were focused (oops) on the perceived image quality, rather than the measured quality, although they did also take time out to write their own image quality measurement algorithm.