[ekianjo]

The Pi4 can hardly handle 1Gb speeds in the first place.

[IntelMiner]

To be fair, the Pi can handle 4Gbps of ethernet traffic successfully as Jeff Geerling demonstrated

[linux4kix]

The LX2160a can handle up to 130Gbps of network traffic. That is what it is designed for. You also have the benefit that the Quad SFP+ ports can be configured as a network switch completely offloaded from the CPU. That is what this SOC was designed for after all. :)