jmarantz commented on issue #1543: Problem with pagespeed filters URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1543#issuecomment-374695510 The trouble you are seeing is that PageSpeed does not consider it an error to serve unoptimized content; as it's trying to optimize for end-user experience, based on an assumption that it's faster for a client to receive an unoptimized resource than to wait for it to get optimized on the server. In the same philosophy, a cache does not consider it an error to respond with a MISS if an item previously inserted was evicted -- and these two concepts are related. There are, however, some things you can do to mitigate or eliminate the problem. The one I'd recommend is to tweak timeouts to make it very unlikely you'll see an unoptimized asset. See https://www.modpagespeed.com/doc/system#rewrite_deadline Go ahead and set that to 10 minutes if you like :) The default is 10 milliseconds. There's also a testing path to guarantee an optimized result, but it requires setting a request header, which you won't be able to do in PageSpeed Insights, so I'm not going to go down this road right now. The ImplicitCacheTttlMs helps avoid expiring resources out of cache, but doesn't guarantee that they won't be evicted if the cache is too small. So you just need to allocate enough cache space. Also that doesn't say anything about the first time an asset is seen.
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