Hi!,
In the node “spline” option change spline time mode to “length”.
And yes you can import spline from Cinema 4D. just convert the spline in editable spline before saving.
I’ve been playing around with it today and I’m dealing with a scale of 200 in length.
The path nodes are like 0 - 150 - 175 - 185 - 200 and it really ramps up towards the end and has slight in and out smoothing to each node while move along it.