The remote event handlers are being called serially.  The way to fix this would be
1) - call each handler yourself by doing something like
            CAOEventHandler_String_delegate                        seh = null;
                foreach (Delegate seh_delegate in CAOEvent_String.GetInvocationList())
                {
                    try
                    {
                        seh = (CAOEventHandler_String_delegate)seh_delegate;
                        seh(event_string);
                    }
                    catch (Exception ex)
                    {
                        // Removing event handler because of error
                        CAOEvent_String -= seh;
                    }
                }

AND
2) - changing the call I have above to seh to an async remoting call.
  or the other #2
2) - make the code on the client side immediately change threads to do the actual work and that would let the server code
continue.
    (this is NOT the better choice)

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Roy Chastain
KMSYS Worldwide, Inc.
http://www.kmsys.com