Please do follow the below steps when the Application goes slow or unresponsive :
First you would need to find the Process id of Java which runs the Application.
How to find it ?
When you start the Application and start using it, you will have a java process running in Task Manager which will have a PID (process id) under details.
In the screenshot, the PID is 14992.
Now the Next step is to download a file called server-jre-7u55-windows-x64.tar.gz and extract it under ManageEngine\SupportCenter directory.
Just like this :
When you extract the file, you would find a folder called jdk1.7.0_55
Then open a cmd window with administrator priveleges and go to this location :
server-jre-7u55-windows-x64\jdk1.7.0_55\bin
Then execute this command : jstack PID > threaddump_non_ui.txt
Just like this :
Once you execute the command, hit enter and you will find a thread dump file inside this location :
ManageEngine\SupportCenter\jdk1.7.0_55\bin
You can send us the thread dump file when the Application goes slow or unresponsive which will lead us to fix the mail fetching issue as well.
You can send us the log file as well.