A NanoPI with OpenWRT (there is a variant that NanoPIs have that is called FriendlyWRT, but don’t use that, it sucks), they have an ARM CPU so the power usage is low. My NanoPI R5C can reach up to 600Mbit/s (up/down) with SQM enabled (Smart Queue Management, to keep your latency down on high network usage), and 800Mbit/s with something called Hardware offloading.
A NanoPI with OpenWRT (there is a variant that NanoPIs have that is called FriendlyWRT, but don’t use that, it sucks), they have an ARM CPU so the power usage is low. My NanoPI R5C can reach up to 600Mbit/s (up/down) with SQM enabled (Smart Queue Management, to keep your latency down on high network usage), and 800Mbit/s with something called Hardware offloading.