Issue in SOAPUI MockService DelayResponse

Hi All,

i have created a mockService in SOAP UI and i am sending request to it at the rate of 300Requests/sec with delay response 29999ms (ie 29sec)

but after some times i noticed that soapUI is taking more time then specified (like 100+ sec) and it is keep increasing.

is there any issue with SOAP UI or is this a configuration issue?