From VFXPedia

Reduce Points

The Reduce Points dialog can be used to decrease the number of points in a spline. Fusion will attempt to maintain the overall shape of the spline, while eliminating redundant points from the path.

Select Reduce Points from the context menu to display the reduce points dialog. The dialog that appears contains a slider with a range from 0 to 100 that represents the accuracy of the spline.

When the value is 100, no points will be removed from the spline. Use smaller values to eliminate more points.