I have worked on Tomcat, Nginx for deploying and maintaining Applications. Site behaving slow is quite a generic issue and I have lots of experience in this kind of scenario. I can help you with this
Relevant Skills and Experience
Tomcat, Weblogic, Nginx, IIS, Oracle Database
Proposed Milestones
$2 USD - Cross - checking the application Performance
$3 USD - Thread dump of the process currently running
$4 USD - Checking the DB I/O if that is relevant to the issue
$4 USD - Checking the connectivity between the application servers and DB servers
$4 USD - Checking the number of active connections, checking if App server is capable of managing the load
$3 USD - Providing quick fix for resolving the issue, Providing ways to manage the server more efficiently
Tomcat and Nginx Version Details.
OS in which the services are installed, DB Version