oschaaf commented on issue #1882: Pagespeed rating drops after a couple of 
hours? Why?
URL: 
https://github.com/apache/incubator-pagespeed-mod/issues/1882#issuecomment-491030305
 
 
   Well, referencing resources in css that respond with 404 can cause unsteady 
results (because pagespeed will remember that 404 for 5 minutes and then try 
again).
   And then there's beacon expiry as well:
   
https://www.modpagespeed.com/doc/config_filters.html#FinderPropertiesCacheExpirationTimeMs
   
   Bumping the file cache clean interval may mask an undersized cache; is would 
be better to size it properly I think. Ideally, ballpark it should be able to 
hold 3-4X the sum of the size of the original resources.
   
   Otto

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