@ComfySofa Just to come back to this with a bit more info.....i got sidetracked by my home assistant server crashing so ive not had the chance to go back to it. Did some testing with the proxmox box...

Ah - right...ok. If it is hardware i hope they can fix this with a future firmware update....

@GrenSo I did have a tidy up of my networking cabinet last night....didnt have enough time to finish...... i flattened the proxmox box and tried again - no luck, so dropped back to the 1GB line which...

@INTRASERVERNET Im seeing the same issue on the host server also - so not sure (in proxmox) where i change that option. If the root hypervisor is slow then the vm is not going to change in speed.

@INTRASERVERNET ok - thanks very much for that. As you say....kind of the same but im seeing the slow upload and download cross the vm and the hypervisor also....as i say ive not got anything...

@ComfySofa Just to add to this ive just tried copying a 5gb iso from a VM on the Proxmox server (Win11 24H2) with all drivers installed - I could barely get a 1meg transfer rate, to another VM on...