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Are you sure you are running a real time kernel?

What does:

uname -a

report?
 

How much "problem" is there? What type of machine? Even in CNC boring heads with a single point cutter are still "a thing".

Maybe your axis are not exactly perpendicular?

Can you measure it simehow?
I had huge backlash on my 2nd hand machine, the rubbers of the couplers between ball screw and coupler were "disappeared".
Another thing I found is a damaged bearing that keeps the ball screw in place. Then the complete screw can move a little.

Happy trouble shooting

I installed debian 12 and then linuxcnc using the sudo apt install method on a computer that used to run linuxcnc on debian 10.

The jitter numbers are huge, around 50,000,000 ns.  On debian 10 they were more like 50,000 ns.

What happened?

Found this just now, the datacenter featured in Batman vs Superman is made by the EMC2 company, they are the reason we had to change the name of this project to LinuxCNC.
At least they did not sue us, so thank you...maybe?!?!?!

Might have better luck with this in the Debian forums, it is Linux related.