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Explaining why you should and how you can test your web application using JMeter test plans to determine the scalability. By knowing how good or bad your application performs you can then make the decision to optimize it.
But where to start optimizing? => You need to profile your application in order to see the components which have the most impact in your application regarding number of method calls, memory consumption and CPU time used.
XHProf is a good hierarchical profiler which you can use to generate the callstack and a callgraph of your application (directed acyclic weighted graph) to see where you could start optimizing your application.
This talk was presented on the TYPO3 DevDays 2015 in Nuremberg.