Brand new TB4 Dock throttling Lan Speed badly

Question

Brand new TB4 Dock throttling Lan Speed badly

Anonymous

I have a brand new Surface studio 2 with a new TB4 dock. The TB4 is connected directly to Brand New Shaw Router XB8 1.5Gbps LAN port with a CAT8 Lan cable, yet i am getting at best 150 Mbps speeds up/down, nowhere near the supposed 1.5Gbps speeds. Even with new CAT8 LAN cable nothing has changed. On wifi i at best get 350Mbps

I have updated the Surface, i have changed the TB4 Dock driver, I have even had the ISP out who confirmed incoming speeds of 1.7Gbps.

I don't know what to do more to solve this problem

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Answer 1

Hello Clintwade,

Welcome to Microsoft Community.

I believe you must be using this Dock:

But let me show you the data transfer speed corresponding to each port:

If you access port 5 in the screenshot, that is an Ethernet port, and it actually supports a transmission speed of only 2.5Gbps(that is 312.5MBps). So it can't get to 1.5Gpbs anyway.

I know that you have confirmed with your ISP that the network you are using is 1.7Gbps, so this means that the network should be 1.7Gbps when you access the Shaw Router XB8 router. At this time, you need to find a way to test whether the Ethernet transfer speed from the Shaw Router XB8 is only 150 Mbps. The Surface Thunderbolt™ 4 Dock does not reduce Ethernet transmission power unless this is due to the router's own limitations.

Best Regards,

Mitchell | Microsoft Community Support Specialist