Disabling autotuning will decrease count of DNS lookup and network discovery requests.

Open command prompt, follow Steps in Bold and see console output below:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users>netsh interface tcp show global
Querying active state…

TCP Global Parameters

Receive-Side Scaling State : enabled
Chimney Offload State : automatic
NetDMA State : enabled
Direct Cache Acess (DCA) : disabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled
** The above autotuninglevel setting is the result of Windows Scaling heuristics

overriding any local/policy configuration on at least one profile.
C:\Users>netsh interface tcp set global autotuning=disabled
Ok.
C:\Users>netsh interface tcp show global
Querying active state…

TCP Global Parameters
———————————————-
Receive-Side Scaling State : enabled
Chimney Offload State : automatic
NetDMA State : enabled
Direct Cache Acess (DCA) : disabled
Receive Window Auto-Tuning Level : disabled
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled

Enjoy,
IB