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Tested it today - working nice. Except it freezes few times, while putting in out parport. So maybe hardware thing / noises. On my venerable foam cutter. And of course due to lover latency its even sounds differently. Normally it runs on t61 laptop, which have nothing good on latency side. But it works .

If close and run LinuxCNC again, does it show the warning again?
If yes, most probably something with the video subsystem going over network causing delays.
Very hard to pinpoint, but try running LinuxCNC from a terminal, should have more info.

Mains filter, ferrite cores on motor wires wound once or twice, proper grounding on all power modules and drives, signal wires shilded and grounded to one side only prefferably near the inputs, all grounds wired to a single point/rail in the box, avoid ground loops, short cables - never coiled.