Installed Pagespeed in front of Varnish proxy for fpc, #pagespeed on; and #pagespeed FileCachePath /dev/shm; (both disabled) ttfb on warmed cache is ~90ms. Uncomment FileCachePath (leaving it as the #pagespeed on; is still there) and the ttfb goes to 350ms on a warmed cache. It looks like pagespeed is adding 200-300ms to the equation, same when pagespeed is switch on, is it really that inefficient.
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That is surprising, but we'd need to know more about your configuration to troubleshoot. Probably your best bet is to email us at groups.google.com/forum/#!forum/mod-pagespeed-discuss or groups.google.com/forum/#!forum/ngx-pagespeed-discuss . Please add more information: your entire configuration file, does every fetch get slowed down this much? etc.
- sligocki
1 Answers
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We've run many tests and never found mod_pagespeed to be this slow. That's very strange, as I mentioned in the comment, you should email the discussion forums and we can help debug.
However, on a side note, it is rather strange that you are putting mod_pagespeed after varnish, usually people put varnish after mod_pagespeed. That way all the rewritten resources can be cached efficiently by varnish.
