Slow Performance on Windows 7 while browsing IIS Apps - AutoTuning

We recently migrated all our IIS applications from old Windows 2000 Servers to Windows 2008. It was not a smooth ride but we did manage to get 99% of them into the new servers. There were ofcourse some apps with exe's that were not supported or cannot move to x64. Parallely most of our users were being upgraded from their Windows XP to Windows 7 PC/Laptops.

We found that users connecting from Win7 to IIS face performance problems in the corporate network. The performance was so bad that it took 20+ seconds to display a single page. We also found that the sites worked perfectly when users connected to IIS via a reverse proxy or when they connected using a Windows XP machine.

So the problem was with Windows 7 and by trial and error method we found that AutoTuning was the issue. I think Microsoft enabled AutoTuning by default in Windows 7 and somehow that setting is not compatible with our network gear.

To disable AutoTuning on a Windows7 Machine.
1) open command prompt as Administrator
search for cmd in ‘Start’ and press CTRL+SHIFT+ENTER instead of just enter.
2) paste the below command to get Ok.
netsh interface tcp set global autotuning=disabled