What's wrong with image dimensions?

Yes, what's wrong? I say you - pretty much is wrong. I've completed a kind of little study for our firm about how well is image optimization in times of mobile first. You know what! I was disgusted twice:

1. roughly 85% images are oversized - this is not a dark secret, we are used to this in the meanwhile,
2. roughly 20% images are oversized in terms of dimensions: it means 20% of original images are higher than their displaying dimensions.

Read further: study setup, detailed results, toolchain and scripts

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