[cflat]

A few clarifying points: * the author specifically said -1% Conversion. If this were AWS, that would mean a daily reduction of $6million in revenue! * the author specifically says this is for IE users. This implies two things: a) webp is not an option and b) likely we are also talking about lower class of hardware (mom & dad). I would expect WebP had older hardware probably has the same kind of performance tax, but it's harder to identify because at least with IE/Edge there is an implied age-of-hardware