I use OpenWRT/LEDE since some years now... On a virtual machine using proxmox hypervisor (KVM).
For now, we have an internet dial up that have more than 120Mbps bandwith. But when i use my OpenWRT on KVM, i only have 30-40Mbps. If i try a test trought the internet box directly, no problem my performance wil be very high.
And by OpenWRT, i hurt the limit 30-40Mbps.
My KVM use 2 LAN car virtio. My Host is AMD Ryzen or Core i5 last gen. My KVM have 4 core and 512mb memory.
A fine tunning allow me to have a full bandwith using my LEDE KVM?