Hope this helps someone before they fall into this trap. I finally figured out it was any MacBook Pro using an external ethernet adapter and Big Sur. I assumed the problem was with the new ISP circuit or a QoS policy. The Speedtest app from Ookla from the Mac App Store appears to return accurate results on MacBook Pro's running Big Sur with external ethernet adapters.Įarlier this week, our office upgraded our internet circuit and I "spent hours" trying to figure out why our speeds were so bad using which has always been relatively accurate. In the real world, that may mean slower data transfers from. I did notice Intel and M1 Mac Mini's with built in ethernet running Big Sur did not have this issue. But a USB-C hub with a display, and Ethernet, and external storage, and a mouse and keyboard all attached to it may clog the USB-C port. I tried SEVERAL different ethernet adapters and experienced the same results. The Dell Adapter- USB-C to Ethernet supports up to Gigabit Ethernet data speeds, so you can enjoy faster streaming of online content, from news and live sports. There are big differences in the network speed possible based on the VM size. The same test on MacBook Pro same model running Catalina and it returns accurate results. PS C:> Get-AzureVM ft Name, IpAddress, Status -AutoSize Name IpAddress. If you run a speed test from or any other speedtest site in any web browser on Big Sur, the upload results are way, way off, typically the results show half to a third of the actual speed. I have tested this on two 16" 2019 MacBook Pro's running Big Sur. I discovered an unusual issue this week and was wondering if anyone else has seen this problem?
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