jmarantz commented on issue #1266:
URL: 
https://github.com/apache/incubator-pagespeed-mod/issues/1266#issuecomment-681918518


   For the record, PageSpeed caches optimized results server-side, to avoid
   delaying responses to users. Initial requests for a website are served
   unoptimized, while the optimization occurs in the background, server-side,
   and saved in cache. Subsequent requests are served optimized quickly.
   
   There is an increase in response time for HTML when running PageSpeed, due
   to parsing overhead, but on modern processors with reasonable size HTML
   pages, it is generally just a few milliseconds.
   
   
   On Thu, Aug 27, 2020 at 8:18 AM Guillaume <notificati...@github.com> wrote:
   
   > Sorry, I closed this issue but didn't resolve it. I uninstalled the
   > Pagespeed module and performed the optimizations manually. I'm sure it will
   > always give better results than using this module. Many of its
   > optimizations are done at runtime, that is, after the user has requested a
   > page and before receiving the response. This increases the response time.
   >
   > Anyway, I remember that this CentOS server was a "semi-self managed" VPS.
   > By "semi-self managed", I mean a fork of the Plesk panel and scripts run
   > via cron jobs and written by the host provider. Honestly, it was crap and
   > there were recurring issues. I also remember using httpd to (re)start and
   > stop the service, and that it was serving files in /var/www, which was
   > owned by www-data. This means that /var/log/pagespeed may need to belong
   > to one of these users/groups, depending on how the install script of this
   > module checks which user Apache is running with.
   >
   > Hope this helps a bit. Feel free to open a new issue, but you can see that
   > it was open for 3 months without receiving any response.
   >
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