You can totally serve a superlight image by default which embed an hyperlink that point to the higher resolution image for those wishing to see it.

the holy patron saints of the internet gave us javascript and hyperlinks so that we could have both a gargantuan picture of a bee and a fast, responsive, small web transfer for discovering that gargantuan pictures' availability.

people forget these blessings, and we are now forced to eat 6MB of bee.

praise be the conscientious and adaptive-delivery-aware web engineer, amen.