ShadowXVII commented on issue #1685: Pagespeed causes high FTTB on nginx
URL: 
https://github.com/apache/incubator-pagespeed-ngx/issues/1685#issuecomment-613142726
 
 
   ### Timings
   @Lofesa , re: TTFB, I wasn't clear with my timings -- the full details are 
provided by Chrome which the lionshare of that figure is TTFB in my scenario.
   
   No Pagespeed in URL (standby)
   
![image](https://user-images.githubusercontent.com/446329/79169561-1db2ab80-7e30-11ea-8111-b646f0d33ac8.png)
   
   With PageSpeed (?PageSpeed=on&PageSpeedFilters=%20debug)
   
![image](https://user-images.githubusercontent.com/446329/79169602-315e1200-7e30-11ea-8746-528a7b2ab7e5.png)
   
   ### Cache
   I think Cache Control might be the culprit here (or rather, is causing it to 
look like PageSpeed).
   @jmarantz , I'm not sure -- [the documentation is 
ambiguous](https://docs.microsoft.com/en-us/azure/frontdoor/front-door-caching#cache-expiration)
 -- It says "assets" are cached, but doesn't mention HTML output. The origin 
request is explained 

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