Set curve time to 1 for curves completely right or left of point for better performance. Note that we cannot set the time to 0, because this would invoke special handling for crossing at the curve's start point.

src/path/PathItem.Boolean.js

@@ -515,7 +515,7 @@ PathItem.inject(new function() {
             var t =   po === o0 ? 0
                     : po === o3 ? 1
                     : paL > max(a0, a1, a2, a3) || paR < min(a0, a1, a2, a3)
-                    ? 0.5
+                    ? 1
                     : Curve.solveCubic(v, io, po, roots, 0, 1) === 1
                         ? roots[0]
                         : 0.5,