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I’m wondering if a possible use case for this is to use it to warm up app servers when doing deployments?

Enumerate through a list of pages on your site and use something like Puppeteer to simulate hovering over links on each page.

Why would you simulate hovering over links if you can just visit those URLs directly? If you want all links anyway, you lose the real optimization here, which is not the preloading itself, but limiting that to the (small) subset that a particular user seems interested in.

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