about soaplib demo's time latency

[Stephen.Wu]

I just follow the instructions below - http://soaplib.github.com/soaplib/2_0/pages/helloworld.html
to establish a soap server. After starting the server, everytime I run
the client script, I fetch the response nearly 20 seconds afterward.
Why this happen?
I just want the server send response asap then the client will show
the result to me immediately.

please give some hints. thanks