(RWIN) = 32768

[Anno Domini]

I followed your instructions JJoe, and here are some test results with and without Proxomitron. Note that all https://www.speedguide.net/analyzer.php tests alert my firewall and ask me to connect out through port 8080 to IP 68.67.73.20.

1.) After setting 'no proxy' in Firefox and not using Proxomitron, the test results were:

Default TCP Receive Window (RWIN) = 131072
RWIN Scaling (RFC1323) = 9 bits (scale factor: 2^9=512)
Unscaled TCP Receive Window = 256

I don't understand the above result because both my TcpWindowSize and GlobalMaxTcpWindowSize are set to RWIN 1027840. See attached photo. I thought the speedguide test would show 1027840 too, but it shows 131072.

2.) After adding 1027840 with the spaces to the default.cfg (RcvBuf = 1027840), saving and exiting the Proxomitron, starting Proxo, and then opening speedguide.net/analyzer in a new instance of Firefox, the results were:

Default TCP Receive Window (RWIN) = 2055680
RWIN Scaling (RFC1323) = 5 bits (scale factor: 2^5=32)
Unscaled TCP Receive Window = 64240

I don't get this result either. The speedguide comment about 2055680 says, 'RWIN seems to be an excessively large number.' I did notice in my default.cfg that after adding RcvBuf = 1027840 to the bottom of the Global section and saving it, when opening default.cfg again MaxCapURL = 100 had switched places with RcvBuf = 1027840 and MaxCapURL = 100 was now at the bottom of the Global section.

3.) After removing RcvBuf = 1027840 and adding RcvBuf = 513920 to the default.cfg the results were:

Default TCP Receive Window (RWIN) = 1027840
RWIN Scaling (RFC1323) = 4 bits (scale factor: 2^4=16)
Unscaled TCP Receive Window = 64240

This 3rd result matches my TcpWindowSize and GlobalMaxTcpWindowSize, which are set to RWIN 1027840, but none of this makes sense to me at this point, lol. I don't know what to make of it.