How to Laggy trace ?
This bug appears in the Desktop version (GGB Classic 6.0.496) on macOS Sierra 10.12.6. When viewing the same file in GGBTube, it is not present.)When tracing out the evolute of a curve (example here: ellipse), the coordinates do not update fast enough and the trace is jagged. The effect can be minimized by moving the free point very slowly.
The evolute point (center of osculating circle) is calculated via Curvature and CurvatureVector as shown in the Algebra pane.