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The Windows size is what a sender may transmit. It is not a requirement that a client must push each connection to the limit of the allowed windows size.
There might be limit on the server or client preventing it from eating up all CPU resources. Our team still curses the backup process that started at 01:10 at one particular customer and caused alarms to go of on about 15 to 30 minutes after that because our management connections started to fail in the night.
So I suggest you check resource usage on both client and server. as I suspect that is the limititation you need to look into. (Or accept as a wise precaution.)