strange vm network speed issue

Hi,

I have a strange issue with my network on Proxmox 7.

When I use iperf between a connected PC and the Proxmox host, I get around 920-945 mbit/s.
Between the Proxmox host and a linux VM, I get 3-7 gbit/s. (everything correct so far)

But between the connected PC and the linux VM, i get only 600-780 mbit/s (most at the time 745 mbit/s).

With reverse option the result is the mostly the same with minor speed differences.

I tried it with the onboard RTL8111 nic, the pcie intel nic and usb...

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