Urgent... RPC Function

Hi,
 
I am facing a peculiar problem... 

The deployment is Client - Server solution using DCOM over Leased Line
Network ( <= 64 MBPs).
Protocol used  - TCP / IP
 
The DCOM Server uses QueueUserWorkItem (ThreadFunc, NULL,
WT_EXECDEFAULT) to send messages to client asynchronously.
 
THE PROBLEM -
The DCOM Server generates messages in rapid succession ( in a tight
loop) for client. However, the client does not receive all those
responses. When sniffed on Server side, it was observed that the DCOM
server did not send ( or dropped ) many messages to client. Has any one
faced such a problem? Is there any problem in calling QueueUserWorkItem
in a tight loop? Especially, on slow networks? (Note - It works on LAN
i.e. baud 2MBS and above.)  
 
Any help in this regard is highly appreciated 

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