Question

What is Process Monitor in Process Admin Console and how to interpret and use it?

Answer 1

1) its first place to look when investigating a performance issue
2) look for activities or services that are taking a long time
3) you can drill down into a process instance to see the performance of individual activities

Refer here -
http://www.ibm.com/developerworks/bpm/bpmjournal/1312_chan/1312_chan.html