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While I think that the overhead on it's own might not be that much, even little gains of tens of MS can add up to improve the experience.

And something like srcSet will possibly allow the useragent to become "smarter" in the future. Perhaps halving image size when low on battery, or when on a limited mobile plan.

This isn't you choosing which image to serve who as a developer, it's serving up a bunch of options and letting the useragent choose which it knows is best for the user at that time.

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