RP2350 
Pico 2 W Wi-Fi: from 0.07 to 19.5 Mbit/s
How I took the Raspberry Pi Pico 2 W’s TCP transmit throughput from 0.07 Mbit/s with the stock example to about 19.5 Mbit/s at stock clock and an in-spec bus, by measuring each bottleneck instead of guessing at it.