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The comments have been placed here between the two images in order to push the second image further down, so that you need to scroll down to see it.
'Lazy loading' is a technique to make images that are outside the viewport not load until they are inside the viewport. It is a way of speeding up the delivery of page contents, so only what you first see when opening a page is fully loaded, and elements further down the page will only be loaded when/if you scroll down view to them. This is especially useful if you have very long pages with a number of images. The blurred images that appear first are just mini-mini versions of the 'real' images, and they get blurred when they are shown in the size of the real images.
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