Reduced download speeds with Server 2022 Routing NAT (default router override)

Hello, any help on this appreciated. I have a Microsoft VS 2022 set-up on our ZeroTier network to solely handle NAT - nothing overly labour intensive. I’ve configured NAT on the server which receives packets from clients and works fine. An IP look-up also shows the public address I was expecting to see. Those boxes are ticked. The only issue I seem to have is a reduction in download speed. I currently get 800mb - 1GB per second speeds, however, when the default router override is ticked, speeds drop to around 100mb - 150mb per second. The server hosting the NAT also receives around the 1GB per second mark. I’ve checked double NAT etc, but that seems fine. Is there something obvious that I am missing?


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