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Weird that spidev doesn't show up, I think that the overlay is not complete, since it worked (or at least visible) before you could try to add the overlay files of the other boards to see if it helps.

The (gpu?) lag is probably because all the small cores are isolated now, you can try to see if the latency is still low enough with less cores isolated, isolcpus=3-5, isolcpus=4,5 or isolcpus=5. The first 2 cores are faster, so ideally you would isolate the second core, but then I think it should be changed in the source of LinuxCNC to run on that core instead of the last core, but 31.8us is certainly not bad
So you can try the following config:

Where did you read about Ethernet compromising performance?
Mesa has no such issues, they can do easily MHz range pulses, KHz servo rates (i have tested at 4 KHz 5i25, 6i25 and 7i92).
I have several industrial machines using Mesa, in use daily for many years. Retrofit and build logs are on this forum and youtube, but my videos are cr@p compared to RotarySMP's.

Ah, i´ve been watching your stuff for a while to get a sense for what i am getting into, nice content!
You are using a pretty elaborate control interface on your Schaublin. I am not sure if i want to go down that route though. All i need is some jogging control to set offsets, tool measurements, start stop and feed override. My idea is using a USB pendant, a footswitch for my chuck and everything else on a touchscreen.
For years i have done nothing but adjust tool offsets on the control itself, everything else is straight from cam. And for jogging a pendant doesn´t need to be real time control via the FPGA in my mind.
Or am i totally wrong about LinuxCNCs control interface?

Regarding max step rate: that potential bottleneck is eliminated with Ethercat, there are no pulse/direction signals. Instead a new target position is give over EtherCAT to the driver.
I think the two technologies complement each other. If you have/want to use traditional drives with pulse/direction or analog voltage control you go with Mesa. If you want to invest in a field bus system with drives and other units, you go with EtherCAT.

Hi
In Qt Designer, how can I edit an entered g code using the qt widgets??

Good morning guys, I bought my nvem v5 board to test with linuxcnc, I'm still waiting, I saw in the files that there is an encoder component to compile in linuxcnc to use in remora, this component was created to only accept the mpg encoder or is there a possibility of using the mpg input to connect an encoder to a spindle or the spindle shaft of a lathe, I don't know if it is possible to use just the mpg encoder input or there is a way to use other inputs if configured, could you give me more details of this part of the encoder on the nvem board? thank you in advance thank you very much