Latency spike on special button (lenovo T530)

I totally agree Yours comments about laptops, however I am clearly fall into entry level / learning machining. I don't mind if loose a part (once in a year/month?) and I don't think that improper control can damage my machine anyway (to small and to slow steppers). This is old emco PC with a few home-made modifications and 300mm/min max speed, that You can carry yourself form desk to desk - how this compares to seuchato machines ?
Maybe when I finally learn something more about CNC machining I will re-think these assumptions.

Some more free comments about laptops and T530:
- I also detected latency spike whenever I am connecting / disconnecting power supply, most likely from the same source as FN-keys. It all points EC for now.
- It is quite sensitive to BIOS settings (hyper-threading mostly).
- I think that 1vyrain mod (jailbreak) and possibility to switch OFF intel ME, and tune some more "factory" settings also helped a bit.
- I use my own RT kernel compiled specially for this laptop + linux compiled with CFLAGS specific to a processor.

- I really tired to cause some real failure with 1.5ms servo thread and Mesa on USB->ethernet converter - no "luck" for now. Biggest noticed spike is ~300us, and no connections problems. Of curse do not take this as recommendation - these are just mine tests on specific setup.