In reply to fwolf.

This has more to do with the fact that the img srcset in WordPress feature was limited to a max image size of 1600px, so for Retina and hi resolution screens, often times the browser would automatically pull the unoptimized Original image if it needed something with higher resolution. And since most themes don’t create anything larger than the “Large” size which is 1024 (I think), huge Original images were loaded instead.

Implementing this fix means that there are additional thumbnails at larger sizes that can be pulled by the browser, and NOT include the Original.

Believe me, as a photographer, and a developer that works primarily with photographers, this is a feature I realized was necessary shortly after 4.4 came out. If you look in TRAC, I was raising this concern 2+ years ago.

This is a much needed fix, and I appreciate that Morten, and the Media team are getting this incorporated.