Avoid lazy-loading images and embeds unless there are URL Metrics for both mobile and desktop #1604
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See discussion in #1596 (comment)
We can only safely lazy-load anything once we have collected URL metrics for both mobile and desktop. If we've only collected URL metrics for mobile and there is a lazy-loadable element which is not visible, it would be an error to lazy-load it if that element does get displayed on a larger viewport (e.g. desktop).