Responsive images have been keeping us on our toes for quite some time, and now that they are getting traction in browsers, they come with a scary problem: the need to efficiently resize all our image assets. The way responsive images work is that an appropriately sized image is sent to each user — small versions for users on small screens, big versions for users on big screens.

It’s fantastic for web performance, but we have to face the grim reality that serving different sizes of images to different users means that we first need to create all of those different files, and that can be a huge pain.

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