esp32 Ethernet throughput is generally faster than Wi-Fi. There are two phisical ports plus one virtual host one in esp32 ksz8863 dual Ethernet ev kit. and the host one will have an IP from router in simple switch example. so I have used Iperf3 between a PC(A router's LAN side) and another PC in esp32 ksz8863 ev kit...

ESP32 + KSZ8863RLL Development Board — Wi-Fi and Dual Ethernet in One! The ESP32-KSZ8863RLL Development Board is an integrated IoT development platform that combines Wi-Fi wireless networking with a wired dual-port Ethernet switch. Based on the powerful dual-core ESP32 MCU and the KSZ8863RLL 2-port switch chip...

It's a simple demonstation of ESP32 + KSZ8863 + Modbus TCP Slave (TCP Server) + SHT40. it reads and updates the temperature and humidity from Sensirion's SHT40 via I2C every one(1) sec. The reason I adopted the Sensirion's SHT40 why it's pretty accurate and relatively affordable. if you need more accuracy and precise tolerance, consider SHT45..,,,