SugarCRM Monitoring Tools

Hi,

Lately, our SugarCRM is very slow to queries. Especially, we find that the Frontend is unresponsive for more than 10 seconds in some specific pages. The server is responding with data within milliseconds, however to display this in Frontend takes very long (between 8-15 seconds). 

Is there a possibility to monitor this somehow in Sugar? Any external plugin that can help me here?