OpenWrt on RPi4 ?

I need gigabit speed. Does the USB to Ethernet become speed bottleneck?
My WAN connections were less than 100 Mbps each. A friend who tested Rpi4 had 300 Mbps connection said the CPU utilisation was less than 30% during speed tests. I experienced latency with the USB 3.0 adapters I had, so moved to Opnsense after a short time with that setup
 
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My WAN connections were less than 100 Mbps each. A friend who tested Rpi4 had 300 Mbps connection said the CPU utilisation was less than 30% during speed tests. I experienced latency with the USB 3.0 adapters I had, so moved to Opnsense after a short time with that setup
You mean OPNSense on RPi4?