I found a very nice, well written blog serie about tuning and using vCenter Operations Manager written by Phil Barlow on http://www.definedbysoftware.com/
Here are the links to this 5-part serie blog:
http://www.definedbysoftware.com/2014/01/19/tuning-vcops-for-your-environment-1/
http://www.definedbysoftware.com/2014/01/21/tuning-vcops-for-your-environment-part-2-badge-tuning/