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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