performance issue

[Eag. E]

Hi
I am based on CA 11.2 with 4DISP+2CM, today I am doing some performance testing, but found the result is not good.

I run a very large query report (should be finished in about 10 min), and redo the same query 10 times, then my CA is completely down, I can not refresh metres in Administrator, I can not explore content in front end nor back end. No one else can do anything with CA now.

Could I know which service do I need to tune? ReportService or Batch-report service? The output format is html (not excel/pdf)

Thanks