Category Archives: apm

very slow response time that is not indicated in the PHP profiler

I have my cakePHP application (hosted on centOS 7) monitored by appdynamics APM. In their monitoring controller I have breakdown of transactions that take too long.

I also installed a simple chrome page timing plugin. On one of my webpages I got the following results:

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As you can see the page loaded after 157 seconds! However in my APM the slowest Transaction recorded has 'execution time' at 2.1 seconds. If my server serves the pages in under 2 seconds (and usually in around 0.5 second) where does this terrible 157 seconds come from? How can I monitor the source of that load time?