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Let this be a lesson for everyone... If submitting to HN, pick a static cached page of the content to serve or use varnish or something. ;)

• pestaa 12y ago
  Don't just install Varnish in front of WordPress and assume the best. WordPress by default places a cookie in the browser session and Varnish (also by default) will vary the cache results by cookies -- in the case of PHP session IDs, it means Varnish will let each request through. Plan your caches carefully and start from the CMS side.