The new responsive images feature takes some tweaking to make it work optimally. The standard settings work only for the most basic of themes.
Read up on responsive images, specifically the srcset and sizes attributes.
Manipulate the srcset and sizes values through the new wp_calculate_image_srcset and wp_calculate_image_sizes filters.
There’s also a max_srcset_image_width filter that allows you to override the maximum size that gets added to the srcset.
So depending on your theme you could try tweaking those values to get a result that always loads an appropriately sized image.
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