In Cloud Next, request queuing measures the time between the balancer and the Drupal pods. Therefore, you can expect 1-5 ms of response queuing for all requests. However, if the request queues for more than that time duration, the platform does not have enough active PHP processes to serve the request. This results in site slowness for some uncached visitors. Potential causes are:

• Slow external calls

• Slow database queries

• Slow memcache queries

• Slow filesystem operations

You can identify these potential issues in New Relic and improve queuing by optimizing your application’s code. In addition, you can work with Acquia Support to further troubleshoot.

The following is an example of high request queuing in New Relic:

For more information about request queuing in Cloud Next applications, see Why do I see increased “Request Queuing” times on New Relic graphs for my applications under Cloud Next?