Attaching a SplineAnimate Component to a SplineContainer where one of the parent Transforms has a scaling applied, causes a severe performance issue.
On an AMD Ryzen 3900X setup, attaching 20 SplineAnimate Components, costs 200ms and allocates 36KB garbage per frame in the Editor. In a Player it’s about 100ms.
The QA team was able to reproduce the issue. Thank you!
I thought they put in place anti-regression tests. What else went through the cracks…
As a temp fix, make sure the Transform attached to the GameObject with your SplineContainer has a scale of (1, 1, 1). Certain methods (like SplineContainer.EvaluateUpVector()) run much slower logic if the scale is anything else. 
OMG, really??? That’s not gonna work in my case. Time to roll my own spline controller, I guess. 
Did this work correctly in a previous version? Maybe I can just roll back to that.