Hello,
I think you are right, but on initial visit this will happen for sure:
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The browser read the URLs of HTML and load its. So if there is this link into the HTML, the browser will load the 4+MB image.
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Is not possible have a image of 500B. These are not the true file size of downloaded image.
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I dont know good the CDNs, but what I know is that are only storage servers that serve resources from different locations and with a high speed. Not related to this problem I think.
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If I check without cache in inspector I get the full size with 3.6s of loading (this is extremely high, due I have a 50Mbit connection), check http://www.pixor.it/shared/2016-05-16_110736.jpg
But maybe I’m wrong, I’m not a network expert. Anyway I’m almost sure this bug increases the bandwidth usage of 200%, 500% or more, if you consider that the other contents, together are less than 2MB.
Federico