Thank you for your nice information andreasdierl.Yes, it's just what I wanted !

Thank you for good information! I didn't know such a scheme like RDC already exists. I'll contact my account manager. But, if I use Asia/Pacific RDC, visitor to my website from US/Eurpoe suffers from latency. Hopefully, Omniture build CDN-like system to forward each visitor to appropriate data colle...

SiteCatalyst is very nice tool, but it's sometime rather slow in beacon response.Here is a screenshot from Firebug connection log.  SiteCatalyst's JavaScript beacon is consuming visitor's browser load time like:100ms for DNS lookup150ms for connection150ms for 1st byte responsetotal 421ms for tracki...