When Parsing WSDL with Java is so slowly

When Parsing WSDL with Java is so slowly

I'm parsing wsdl with java, the performace is so poor. When I first time
execute it will take about 7 secs, and total average is about 2 secs. It
shoud not caused by network, because I tested it in my local. The code
like below:
WSDLParser parser = new WSDLParser(); Definitions defs = parser.parse(url);
The step 2 will take long time, espically execute in the firet time.
Any suggest?