I am using the latest, 4.09 optimiser and I changed the RWIN? about a week ago and today, I looked at it again and found it back to 10??
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I have tried to find where this setting is in the registry but haven't had any luck. When I backup the settings, there is NOTHING in that file
that mentions Rwin or connection speed. Am I chasing a phantom? or is Windows 10 intentionally hiding it on me?

Any help would be much appreciated so I know I am not losing what's left of my mind

Running Windows 10 17134.167, the NIC is an onboard Realtek crappy one.