Google loads the page in Lighthouse, so it has to be reachable from the public internet — localhost will not work. A run takes 15 to 40 seconds.
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Paste a URL above. This calls Google's PageSpeed Insights API, so the page must be reachable from the public internet — Google cannot load your localhost. A run usually takes 15 to 40 seconds. Without a PAGESPEED_API_KEY in the environment you share one global quota with every other keyless caller, which is usually already exhausted; the key is free from the Google Cloud console.