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i dont think all functions are able to handled with one pico, i have more time now for testing because the first PCB-s are only shipped on mar.23 and the components is in the coming week.

actually not using PIO now, the UDP data transfer runs on core0 and all io handling runs on the second core, i use the W5100s-evb-pico for the project with the wiznet library (using arduino ide) (for PIO testing i make a frequency generator (later stepgen) and send velocity from 1 of linuxcnc joint to it, it makes 2Mhz signal but dont have a fancy scope to find its jittering. Shock settled on my face, and a small smile appeared at the corner of my mouth when I saw the signal on the scope.

Looks promising. Many LinuxCNC hardware interfaces run at 1kHz, and that works fine for most purposes.
Are you using the PIOs to handle the communications? Maybe there are gains to be made there?

Does the Pi-Pico handle UDP natively?

i make another test this time with raspberry pi4 (4gb)