Last year there was some issue with I219-LM, but RL 9.1 reportedly did fix that: Bug in network driver
That can’t be fully true, if the bug mentioned by Phoronix is older than RHEL 9,
but I know for a fact that I219-LM [8086:1a1c] started to work clearly “better” with 9.1.
(“Better” as in “can transfer data” – no actual speedtest.)