Decoding large images can still cause jank on median-low mobile hardware. `decoding` allows deferring decode to avoid janking the page. Browsers are also looking at off-main-thread decoding for images. Some more details from @domenic and c/o in https://t.co/JuoEZlVfyP. pic.twitter.com/bgc87oSQJB

— Addy Osmani (@addyosmani) December 5, 2017