A scaled picture is a picture of fixed dimension so that there is no need to rescale it. If you have a picture of the dimension 250x200px and you show it on the website space of the dimension of 200x150px, it needs to be rescaled on the fly. This is not good when it comes to pagespeed. You should serve the picture exatcly in the required dimension so that original size of the picture is the same as the size of the visible picture on the website.
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