i226-v low internet download (internal network is max speed)

I have a NUC13 with a i226v 2.5Gbit/sec NIC, running on 1Gbit/sec. Proxmox 8 is installed, with the latest kernel. My internet is 1Gbit/sec down/up. All testing is down directly on the Proxmox itself, no VM. On my other NUC8 the speed is always 1Gbit/sec down/up, whatever I do.
When I use scp between 2 nodes, the speed is 1Gbit/sec, as expected. If I run "speedtest-cli" download is normally 200 Mbit/sec and upload is 900+ Mbit/sec.

When I download something from the internet, it "only" goes...

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