jmarantz commented on issue #2089:
URL:
https://github.com/apache/incubator-pagespeed-mod/issues/2089#issuecomment-1098084824
It's possible the reason that TTFB was good for a while is that the
memcached code is good at failing-fast if it looks like memcached is not
working.
I can think of three reasons generally that PageSpeed would make TTFB
noticeably worse:
* HTML parsing overhead: Running with ?PageSpeedFilters=+debug shows us
that parsing overhead is less than 6ms so I don't think it's that.
* Rewrite Deadlines: in the config you pasted above it looks like that's
set to 20ms which should be fine. But it might be worth looking at the config
again to see if anything deadline-related is overridden
* General overhead and queuing on your server. PageSpeed keeps a limited
number of threads for each process, with work queues for each thread, and at
some scale the queue-depths might start growing. There are histograms for that
on /pagespeed_admin.
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