Terrible ethernet speed on Sonoma

I'm currently upgrading to Sonoma and am doing a fresh install of OpenCore. So far I've got everything working but the ethernet connection is terribly slow. So slow in fact that it's always a gamble if even the Google home page will load.

My Motherboard, the Z390 Designare has two Gigabit Ethernet ports:

i219 (IntelMausi kext)

i211 PRO 1000 (SmallTreeIntel82576 kext)

The Dortania OC Guide states that the SmallTree kext isn't compatible with Monterey or above and I would be fine with just one of the ports working properly. So far I'm only using the IntelMausi kext.

Here's my config.plist

Is this a known issue? Where should I start looking for the problem?

submitted by /u/da_fabulous_dude
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