I am doing a Technical Design for a project, which interacts with webservice to fetch particular set of data. The problem here is that the maximum expected SOAP response size is 5MB. In order to simulate this behaviour, I created a Mock Service to return approx 5MB of data & tested the performance through SOAP-UI. However, to my surprise the SOAP-UI says that the response was 11MB! Just to make sure, I copied the response & saved as XML - validated the size , it was same 5MB. So, I started testing on different clients & I get inconsistent behaviour regarding the data returned and the performance by SOAP-UI. For the same 5MB of actual data, different SOAP-UI instances in different boxes have different response times (from 500ms - 5 sec) & different data size (5MB - 11MB). Thus, I assume that this is something to do with the network & hence the question -
What is the network overhead of sending 5MB of data as part of SOAP response? Will the response time be less than 1sec (assuming standard production app network configuration)?
Any inputs on this will be highly appreciated since its always better to find these gotchas before starting development :-)