Hello Gurus,
Indeed the tool is very useful, however I have few more queries to better understand the tool.
I would like to emphasize on Overview Tab first since this is designed to give us overview of the performance (This is what I think 
).
I shall put across my queries on Executed Plan Tab later. I hope that is okay.
1) Time Section
a) What is it compiling? The object is already in activated state. Why is it taking 143 ms to compile? Does this time is included in Execution Time?
b) Execution time is 98.7 s. However, on fetch of 200 records of the same query it takes around 1 min to execute. What this execution time signifies?
2) Context Section
a) Why the system is mentioned here. This is not the actual system name.
b) Memory Allocation: Is this the dynamic memory allocated to each query when it is fired by the user for each execution?
3) Data Flow Section
a) Number of Tables Used: I am certainly NOT using 246 in my model. This is not the real count. Many temp tables which are created while execution of the query can be seen in 'Tables Used Tab'.
b) Maximum Rows Processed: I never tried counting the number records, however, will that soon. (Still would like to know .. to reduce my efforts .. 
)
4) Distribution Section
a) I have always seen the Number of Nodes as 1. Does it signify non-scaled out environment?
b) Number of Network Transfers is always 0. Is this a count of cross tenant requests?
Shirish.