Fills:

1) New algorithm for connecting along the perimeters is now applied
   to Honeycomb, Hilbert and similar planar filling curves.
2) The old expensive path chaining is not applied if the new algorithm
   to connect along the perimeter lines is called afterwards.

src/libslic3r/SupportMaterial.cpp

@@ -2324,7 +2324,6 @@ static inline void fill_expolygons_generate_paths(
 {
     FillParams fill_params;
     fill_params.density = density;
-    fill_params.complete = true;
     fill_params.dont_adjust = true;
     for (const ExPolygon &expoly : expolygons) {
         Surface surface(stInternal, expoly);
@@ -2351,7 +2350,6 @@ static inline void fill_expolygons_generate_paths(
 {
     FillParams fill_params;
     fill_params.density = density;
-    fill_params.complete = true;
     fill_params.dont_adjust = true;
     for (ExPolygon &expoly : expolygons) {
         Surface surface(stInternal, std::move(expoly));