strange behaviour

Dear all,

We are new to this product but currently we encounter a very strange behaviour of it.

We tried to run a couple of load tests and 70% of the result shows a sudden impulse of the response time. Normally, the response time is quite stable. However, all in a sudden the response time will be very slow and then come back to normal providing that no condition is changing by monitoring.

Background Information:
Webmethod is 4.6 version running on Win2000 server and it use a SNA server connect to Mainframe(database).

Thanks for your kindly reply.

A sudden reduction in performance could be due to JVM garbage collection.