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I have been trying to speed up a Drupal site and measuring speed through page speed insight. What really has puzzled me for last few weeks of experiments is that node pages score an average of 170-200ms on 'initial server response time' while taxonomy pages (which are far more important from SEO speed point of time) take an average of 720-750ms in terms of initial page response time.

(Drupal 7, Nginx, Php-fpm, large site with over 100K nodes).

These are all cached pages (tried both Database and Memcache) using Page cache for anonymous users. Why is it taking 4 times more longer for Drupal to serve cached HTML of a term page versus cached HTML of a node page?

I am really stumped. Only time this changes is when I restart the Php-fpm. For a few minutes, term pages are close to 300ms before going back to 700+ms in few minutes.

Any ideas on what could be causing this? Could it be a php configuration issue?

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  • Update - Changing Opcache to file cache has shaved 100ms off slow pages. I guess this explains why site feels faster after restarting php-fpm. Credit to this thread: forums.cpanel.net/threads/…
    – JM John
    Commented Feb 13, 2023 at 0:08
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    The only way to know for sure is to profile.
    – mona lisa
    Commented Feb 13, 2023 at 0:20
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    Have you confirmed (by headers or stepping through the code) that the pages are definitely being served from cache?
    – Clive
    Commented Feb 13, 2023 at 1:19
  • @Clive yes definitely going through Cache. Without Cache, those pages take over a second.
    – JM John
    Commented Feb 13, 2023 at 2:06
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    Technically an answer to this question is "Upgrade to Drupal 10". Current releases have essentially solved this problem. In Drupal 7 I think you have to fiddle around with the Expire module.
    – mona lisa
    Commented Feb 13, 2023 at 3:55

1 Answer 1

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Finally got it to work.

Mistake I made was following.

While setting Cache for views, in the block setting page, I had selected 'Cache for every page'. This was generating and saving a copy of cache for lots of utm parameters/tracking variables and filled up Memcache instance.

Due to amount of views present on term pages, it was slowly them down.

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