@Dmitry thanks! Please see screenshot of perf top. Bandwidth did drop a bit while running perf top.
Hm. @erfus how I can reproduce this locally? Could you describe?
@Dmitry vyos is running on a KVM VM on a very low power board. (pcengines APU4). WAN PPPoE, NAT inside private subnet, a few basic firewall rules, nothing special.
Do you want me to try it bare metal on this board?