Yup. There's a lot of hardware offloading going on inside when running the stock...

flyinghamster on Sept 8, 2021 | parent | context | favorite | on: Low Cost Banana Pi BPI-R2 Pro 5-Port Gigabit Ether...

Yup. There's a lot of hardware offloading going on inside when running the stock firmware. Something like this board, or a dual-NIC mini-PC, and a surplus PoE switch, might be a better choice.