New install on previously working system

That got me up - but now I've got "Unexpected realtime delay on task 0 with period 1000000"

Latency test gives 60624 ns jitter on the servo thread and 70111 ns jitter on the base thread.

If your're running a mes card there is no need to test with a base thread. Servo thread is all that is needed.
Usual advice, turn off power saving, anything that attempts to change clock speed in the BIOS, also turn off hyper threading if that is an option, for a 4 coremachine you might get some relief from isolcpus=2,3

It may help to supply some details regarding the machine you're using.