I am managing a Drupal site and when I first log in and click CiviCRM menu link, there is a long delay followed by this message:
Service Temporarily Unavailable The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
I have increased the PHP max execution time, and it did help to eliminate this message, but the message is happening again. I also increased the memory limit to huge.
Can someone tell me how to set some debugging or logging to show me what exactly CiviCRM is doing during this delay?
Drupal 7.5.2. MySQL 5.5.52-MariaDB. PHP 5.6.30 as FPM. CiviCRM 4.7.16.