it is too fast to use F200 with G2?

OK so there is no feedback so its open loop
with LinuxCNCs commanded position sent
directly to the drive.

This means that the position data sent
is just as shown in LinuxCNC's backplot (which is correct)
which means the error is external to LinuxCNC,
either in the mechanics or the servo drive setup
or interface.

In other words, the error is not in LinuxCNC

what's the meaning there is no feedback? Which object it said? How to judge whether not it has a feedback? Does it need to been added, how to add it?

There is no position feedback sent from the drive to LinuxCNC
LinuxCNC is sending position data to the drive at a 1 KHz rate
(every servo thread invocation) but does not "know" the
actual drive position, meaning for example the following error
is not useful.

There is no position feedback sent from the drive to LinuxCNC? can you tell me how do you get this analysis? How to add position feedback generally?