Refresh Business Componenet of SIM OM PMT Service takin more time when executed in workflow

Hi

Simulation of 'Refresh  Business Component' method of 'SIS OM PMT Service' BS through Business Service Simulator is taking 0.008 seconds where as if same call is happen in workflow then it is taking considerable amount if time

1) 2.415 seconds when BC Name : Order Entry - Line Items and BO Name Order Entry (Sales)

2) 6.344 seconds when BC Name : Order Entry - Orders and BO Name Order Entry (Sales)

ObjMgrBusServiceLog InvokeMethod 4 0 2011-07-07 13:33:33 Business Service 'SIS OM PMT Service' invoke method 'Refresh Business Component' Execute Time: 2.801 seconds.
ObjMgrBusServiceLog InvokeMethod 4 0 2011-07-07 13:33:35 Business Service 'SIS OM PMT Service' invoke method 'Refresh Business Component' Execute Time: 2.415 seconds.