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I noticed on iMac 27" 2020 with 10Gb Ethernet configation, speed sometimes randomly drops to 100 baseTX. Cable is Cat6 and is good never had an issue with it.
By default the Ethernet under Preferences under Networking, it is set to Automatic. If I switch it to Manually 10Gbase-T it works fine and issue is solved.
Has anyone had similar issues?
Same issue here - also with 10GBit option - other computer Lenovo/Macboek pro etc on the same cat6 cable (direct to router or via switch work fine with 1Gib/s - The 2020 iMac only connects after a relatively long time to network and offers only <100 mbit/s.
Reading though some comments there seems to be some correlation with the 10Gbit Ethernet option. After all not good and driving me to return the iMac (sad to change to Win10 after 10 years of positive iMac experience).
The suspect would be the cable or the Router/Modem it connects to.
iMac 27" 2020 10Gb Ethernet Switching to 100 baseTX
