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There's quite a few threads regarding latency, there's a quite a long one from just this week.
Your max speed will be a function of step per rev and your base thread.

You could try isolating the last 2 cores via the kernel command line.

That is because the PP uses G18 to rotate the coordinate system for milling.
Have you tried setting the rotational axis to Z as suggested here:
forum.linuxcnc.org/10-advanced-configura...hine?start=50#327942

The underlying problem is that linuxcnc applies the x-,y-z- tool-offsets internally, so the tool-length is automatically subtracted from the Z position shown in the DRO. That is why the kinematic model for milling has the tool spindle pointing in the negative machine Z direction and the model for turning has it pointing in the negative X direction.
While it might be possible to remove the tool-offset as linuxcnc applies them and add them to different axes in the kinematic I'm rather skeptical that it is worth the effort.
You need to remember that the planner currently has no information about the custom kinematic used, neither does the preview. The nice thing about TWP is that you can load any G17 XYZ milling toolpath and it will be displayed correctly in the screen.
Generally speaking limit violation checking and tool path preview will only be of limited use for more complex kinematics.

Note though that limit values can be changed when changing kinematic modes. For an example see:
github.com/LinuxCNC/linuxcnc/tree/master...xis/vismach/millturn

The actual values are changed using executable Mcodes:
github.com/LinuxCNC/linuxcnc/tree/master...mach/millturn/mcodes

Thanks for your interest! I made several modifications to qt_auto_probe_tool.ngc to improve tool length offset management and work coordinate independence.

Changes Made:
Separated tool length offset (G43) from work coordinate systems (G54/G55), making the tool table more intuitive.

The probe height was defined in machine coordinates and probed at the tip of the spindle.

Ensured tool length offset remains consistent regardless of WCS changes.

Thanks!