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Very slow ethernet speeds

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Hi all,

I've installed successfully Big Sur on the Gigabyte Z370 HD3 (bios 14b).
Everything works fine apart from ethernet and more specific the speed of it.

It doesn't get speeds above 100kb/sec. Of course it doesn't have to do with my router etc as I it works fine on other OS.

I tried so far the following kext (adding/removing each one each time)

1. IntelMausi
2. IntelMausiEthernet

Attached you can find my EFI folder.

Any help is very much appreciated.


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delete and create again in system preferences / lan

go to library/preferences/systemconfiguration and delete content, reboot


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I did the what you suggested but the problem is the same. I did some modifications to my EFI since the initial post (not related with ethernet) but just in case I'm attaching it again for a reference.

Speed doesn't go higher than 100-120kb/sec and at some point they go down to 0-10kb/sec. This problem drives me nuts....



Edited by asmar
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