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It doesn’t work for outgoing links because the gain wouldn’t be as much as the CSS and scripts of the external site need to be loaded in addition to the HTML (o
by dieulot 8y ago
It doesn’t work for outgoing links because the gain wouldn’t be as much as the CSS and scripts of the external site need to be loaded in addition to the HTML (only the HTML can be preloaded).
Also, there’s usually no incentive to improve other’s sites pages load.