How good is Ethercat motion control?

Is there a real delay with rigid tapping when we're using ethercat?

I'm running my old okuma mill with a mesa setup and it's working just fine. Although max I've tapped is 600rpm.

Don't really know how fast the Spindle encoder is read by the mesa. But i guess it's definitely updating every servo thread cycle.

Can't we expect the same performance for rigid tapping with ethercat?