Real Time Scenario 2

If client is complaining that app is slow, then what are the steps which need to be followed up to resolve the issue?

Well there are many reasons for the slow behavior 

1) Check the CPU utilization of the app server and the entire server to see if there are CPU bottleneck
2) Check the Memory utilization of the app server and the entire server to see if there are memory bottleneck
3) Check the systemout.log to check if there are any hung threads or OOM
4) Check the heap allocated to the JVM
5) Check the connection to the DB , it could be possible that the connections to the DB has got MAXED out 
6) Check the Plug-in and web server logs to see if its connection to has maxed
7) Take the thread dump for further analysis

these would be some of the steps to take