It is a setting that exists since Windows Vista and Windows 7, it is listed here:
https://www.speedguide.net/articles/...08-tweaks-2574
It determines whether Windows can limit the RWIN (TCP Window) on its own. It happens if Windows detects packet loss. and tries to limit the RWIN value to cope with it.
Does "netsh int tcp show global" say that Windows has limited autotuning, something like the following message:
** The above autotuninglevel setting is the result of Windows Scaling heuristics
overriding any local/policy configuration on at least one profile
What does the TCP Optimizer say about "Windows scaling heuristics"?
What does this command say about "Windows Scaling heuristics"> netsh int tcp show heuristics ? (there is also a Powershell cmdlet variant of that command)
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