oschaaf commented on issue #1574: prioritize_critical_css 5 minutes clarification URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1574#issuecomment-400809317 When it is time to re-beacon, pagespeed will inject js into the html to make that happen. So you would be seeing one or more beacon POSTS coming in from browsers on the server, which will be used by PageSpeed to construct a fresh entry into the cache. In the period where the cache entry is stale and beacons are needed to determine a steady state for on-page critical data, it is possible that no critical css and/or images are inlined. On site with some traffic, this isn't really a concern in practice, but on a low traffic site this may become significant. Is this your concern? One way to mitigate that would be to configure longer expiry times for the beacon data. Or, alternatively, maybe scripting a headless browser to keep the cache warm would help, if for some reason longer beacon expiry times do not work for you.
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