I tried searching for something *like* what you asked about that I have seen. The hack I saw reduced the attached image to a thumbnail (though it did not actually thumbnail the image). Full image loads, only smaller (size pre-defined), so it won't throw off your pages.
Unfortunately, I can only tell you about it because I couldn't find the damn thing. The hack above is out there though, sorry.
EDIT: Not what I was thinking, but someone posted this today:
https://vborg.vbsupport.ru/showthrea...threadid=52344