> On my logs I can see that HIT's are very fast but STALEs take as much as MISS
> while I believe they should take as much as HITs.
>
> Is there something I can do to improve this ? Are the stale responses a true
> "stale-while-revalidate" response ?or are they waiting for the response from the
> origin server ?
IMO the stale responses can't be as fast as HIT even theoretically (except maybe in 'updating' state with proxy_cache_background_update enabled) since they happen when the cache object has expired and nginx tries to get a new version from backend but for some reason can't get an updated response from the upstream (all the proxy_cache_use_stale states).
I would try to identify why the stales actually happen - is it because the backend fails or there are multiple parallel requests to the same url and something like proxy_cache_lock is also defined.
To speed up the response you might want to check the proxy_*_timeout directives as the defaults are quite high (60sec) and for example proxy_read_timeout is between reads so depending on the object size in case of a slow backend might take even more time.
rr
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