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How do I possibly reduce the time taken by an application packet http from a browser to ethernet of same computer on windows 7? I will be programming in visual studio in c++ in few days. I will creating a possibly lan network to send multicast messages between computers.

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If I understand your question correctly, you may see some speed increase by using "" URLs. The 127.a.b.c IP addresses are reserved for "local" IP addresses. At least for some Unixes and Linux, using a address keeps the packet from actually going to the NIC: there's a short-circuit code path the keeps the packet "inside" the computer. I know so little about Windows 7, and Microsoft has a history of creating really odd network "shortcuts", "performance optimizations" and sof roth, that this could be totally wrong for Windows 7.

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