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Okay, thanks, I will try it out and keep you updated

I will post the full config when I am done

The second image shows seven tabs playing YouTube videos.

I will use the laptop solely and exclusively for the CNC. I will not run anything else at the same time.

Is my laptop suitable? It is a small CNC. I use a feed rate of 1,000 mm/min, and I will use the 5 motors/axes to machine a thin plastic plate (little effort). I will machine molds on 3 axes.

First picture is OK, the second is not, so:
forum.linuxcnc.org/18-computer/40285-bios-settings-pictures
Se what you can disable there, test, if the result is still bad, try this but try this at your own risk as it requires messing with kernel parameters and might leave you with a non bootable system, not terrible if you are still inn the testing phase as you can reinstall in about 5 to 15 minutes depending on the PC/USB/HDD/SDD/NVME speed.

Bumped into this today, goes in great detail on how to tweak and tune for good latency:
dantalion.nl/2024/09/29/linuxcnc-latency...arameter-tuning.html
Not my article.

Your picture here
forum.linuxcnc.org/42-deutsch/56803-glas...85-s?start=10#334968
shows several warnings about permissions, it is not just index, so if you are running as root user, switch over or reinstall as LinuxCNC will vigorously refuse to run properly as root, as will most of the Linux "user space" software.
Also, are you using a parallel port? Why does it say that in the error report?