Network Load Balancing is slow

Hi,

We have script for NLB to work like 1 server at a time.  when we run the script, it took 43 seconds to finish. Comparing it to other NLB cluster it only took 1 to 4 seconds. both cluster have the same setup.

What are the possible issue for NLB to get slow.

wlbs.exe start 10.185.10.198:10.185.10.196 
wlbs.exe enable 5060  10.185.10.198:10.185.10.196 
wlbs.exe drainstop 10.185.10.198:10.185.10.197