I understand that they will do a diagnostic check at no charge. Since you have done extensive troubleshooting already, I recommend taking your MBP to the Genius Bar. The logic board was replaced TWICE, finally resolving the problem only after the second logic board replacement. A “firmware” upgrade resulted in no improvement. I took the iMac to the Apple Store Genius Bar where a logic board problem was confirmed. Extensive troubleshooting steps with re-installing macOS, resetting SMC, changing network switches, ethernet cables, external docks and dongles, etc., failed to resolve the problem. In addition to slow network speed, the iMac also had kernel panics with system logs pointing to a hardware component. This was a high-end iMac (core I9, 64GB RAM, 2 TB SDD, 2.5 GB ethernet). I had a similar experience with a 2020 iMac 27". Thanks for your time and any knowledge or assistance. I’ve been trying to hold off buying a desktop M1 Mac for a while now because there still is not one on the market that meets my high-level purchase criteria (<$2k, 32GB Memory, can utilize 3 external displays), but it seems like every day now I’m inching closer to buying a Mac Studio… ![]() So having laid all that out, I’m hoping to either get more ideas for troubleshooting what my issue may be or a confirmation that I’m not the only person who is seeing this issue and that I likely cannot remedy it without storing my MBP in a refrigerator. The only other computer I saw throttled ethernet speeds on was my wife’s 2018 MacBook Air, which she has mostly stopped using because of thermal throttling (no clue what the temps are, but she had similar issues with the fan running constantly). ![]() My current theory is that the issue lies in my MBP’s thunderbolt busses being thermally throttled because my machine idles around 72✬ and near constantly has its fans running. I also confirmed my wife’s MBP was using the same driver as my MBP.Īfter thoroughly diving into a rabbit hole about MacBook ethernet drivers, I tried testing my MacBook Pro with a 2.5Gbps ethernet dongle which utilizes a different RealTek chip internally as well as a different driver in macOS and unfortunately saw the same Speedtest results as my original dongle. I have seen gigabit speeds on my wife’s 2017 15" MacBook Pro and my Steam Deck using the exact same cable and dongle. I have confirmed that the dongle and ethernet cable I am using are both capable of handling gigabit speeds by testing on other devices. However, despite a wide array of permutations of ethernet dongles, ethernet cables, and testing connections with other devices, I’m left that the issue lies solely with my 2019 MacBook Pro and I’m looking for some assistance or confirmation of that theory. ![]() I also have a gigabit internet plan, so I was very excited to get the improved network speeds. I recently moved into a new house and I’m now able to have a ethernet connection to my 2019 15" MacBook Pro (running macOS Monterey 12.3) that I use for work.
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