Simultaneous DataWedge Requests

I thought I read somewhere in the documentation that if multiple requests are made to the DataWedge API, some may be ignored if the API is busy handling other requests. However, I can't find this anywhere now that I'm reading back through the 6.8 API documentation. I'm deciding whether our application should serialize requests to the API, or allow them to be parallel, and what a reasonable resend time gap might be for unanswered requests.

Any advice is helpful. We are currently writing for the MC3300 and the DataWedge version we have on our test unit is 6.8.50.