jmarantz commented on issue #1663: Chrome's Native Lazy Loading URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1663#issuecomment-531514484 I think it's worth testing via webpagetest. But my reasoning is that an above-the-fold image can be loaded very early, while pre-scanning the first flush-window of HTML or via <link rel="preload">, long before the CSS is loaded that is needed by the browser to execute layout and determine whether the image is above-the-fold. The value-add of beaconing in mod_pagespeed here is that we can remember in the server whether browsers tend to lay out a particular image above the fold. If you instruct the browser-to lazy-load all images without beacons, it will defeat the benefit of preloading the important ones. The browser will have to wait until the CSS is loaded before it can determine whether to load the images.
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