I was wondering the same thing. My setup is a rpi4 and an ESP8266 over udpraw (not WLED) and noticed the color changes lag the video by half a second or more and is annoying. I swapped the eSP8266 out to an ESP32 and loaded WLED and it acted even weirder. Seemed more in sync but would pause or stop. I was hoping to not run wires from where the pi is to the TV. So I assume from what I read that going GPIO18 on the rpi is the best solution? 246 LEDs total. Anything else I could look at that would affect lag? I tried lowering the usb capture resolution from Auto and increased the decimation, but if it is a data to led speed issue and not capture then none of that would help anyways.