Ethernet Speed Capped by macOS over Thunderbolt?

I wanted to reply to this thread: Ethernet Speed Capped by macOS over Thund… - Apple Community but it is now closed. I am also experiencing an issue where my gigabit usb-c to ethernet connection is throttled when using a USB hub. My setup:

14" M1 Pro MacBook Pro, macOS 12.6 Monterey

Belkin USB-C to Ethernet Adapter

LG Ultrafine 5k (1st gen) built in USB-C to Thunderbolt Hub — speeds of 500-600 Mbps

If I plug the USB-C to Ethernet adapter directly into my MacBook, I get speeds of 980 Mbps. Trying to narrow down the cause since the previous thread was a Dell monitor's built-in USB-C to Thunderbolt dock.

I don't have a solution but wanted to provide an additional data point. Below is the info from System Report. Since Apple is now providing the drive, perhaps there's an update when macOS Venture comes out.

Belkin USB-C LAN:

Bus: USB

Vendor Name: Belkin

Product Name: Belkin USB-C LAN

Vendor ID: 0x0bda

Product ID: 0x8153

USB Link Speed: Up to 5 Gb/s

Driver: com.apple.DriverKit.AppleUserECM

MacBook Pro 14″, macOS 12.6

Posted on Oct 15, 2022 9:10 AM

Top-ranking reply

Corrode Author

Level 1

5 points

Posted on Oct 15, 2022 8:46 PM

Well after all that, turns out many others have been doing testing and narrowed it down to a driver issue, so there you go: https://forums.macrumors.com/threads/studio-display-usb-c-ethernet-adapter-performance-issues.2338556/

The workaround is to use a USB-C to 2.5 gigabit Ethernet adapter to hit full gigabit speeds.

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Ethernet Speed Capped by macOS over Thunderbolt?

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