diff --git a/libsrc/meshing/improve3.cpp b/libsrc/meshing/improve3.cpp
index 8400e541..83a8be25 100644
--- a/libsrc/meshing/improve3.cpp
+++ b/libsrc/meshing/improve3.cpp
@@ -1698,7 +1698,7 @@ void MeshOptimize3d :: SwapImproveSequential (Mesh & mesh, OPTIMIZEGOAL goal,
 }
 
 
-bool MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
+double MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
         const NgBitArray * working_elements,
         Table<ElementIndex, PointIndex> & elementsonnode,
         INDEX_3_HASHTABLE<int> & faces,
@@ -1714,10 +1714,10 @@ bool MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
   Element el1b(TET), el2b(TET), el3b(TET), el4b(TET);
   ArrayMem<ElementIndex, 20> hasbothpoints;
 
-  bool do_swap = false;
+  double d_badness = 0.0;
   if (pi2 < pi1) Swap (pi1, pi2);
 
-  if (mesh.BoundaryEdge (pi1, pi2)) return false;
+  if (mesh.BoundaryEdge (pi1, pi2)) return 0.0;
 
 
   hasbothpoints.SetSize (0);
@@ -1726,7 +1726,7 @@ bool MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
       bool has1 = 0, has2 = 0;
       const Element & elem = mesh[elnr];
 
-      if (elem.IsDeleted()) return false;
+      if (elem.IsDeleted()) return 0.0;
 
       for (int l = 0; l < elem.GetNP(); l++)
         {
@@ -1749,27 +1749,27 @@ bool MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
   for (ElementIndex ei : hasbothpoints)
     {
       if (mesh[ei].GetType () != TET)
-          return false;
+          return 0.0;
 
       if (mp.only3D_domain_nr && mp.only3D_domain_nr != mesh.VolumeElement(ei).GetIndex())
-          return false;
+          return 0.0;
 
 
       if ((mesh.ElementType(ei)) == FIXEDELEMENT)
-          return false;
+          return 0.0;
 
       if(working_elements &&
               ei < working_elements->Size() &&
               !working_elements->Test(ei))
-          return false;
+          return 0.0;
 
       if (mesh[ei].IsDeleted())
-          return false;
+          return 0.0;
 
       if ((goal == OPT_LEGAL) &&
               mesh.LegalTet (mesh[ei]) &&
               CalcBad (mesh.Points(), mesh[ei], 0) < 1e3)
-          return false;
+          return 0.0;
     }
 
   int nsuround = hasbothpoints.Size();
@@ -1883,8 +1883,9 @@ bool MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
         {
           //		  (*mycout) << "3->2 " << flush;
           //		  (*testout) << "3->2 conversion" << endl;
-          do_swap = true;
-          if(check_only) return do_swap;
+          d_badness = bad2-bad1;
+          if(check_only)
+              return d_badness;
 
 
           /*
@@ -2079,12 +2080,9 @@ bool MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
           swap3 = !swap2 && (bad3 < bad1);
         }
 
-
-      if (swap2 || swap3)
-        {
-          do_swap = true;
-          if(check_only) return do_swap;
-        }
+      d_badness = swap2 ? bad2-bad1 : bad3-bad1;
+      if(check_only)
+          return d_badness;
 
       if (swap2)
         {
@@ -2279,8 +2277,9 @@ bool MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
       if (bestl != -1)
         {
           // (*mycout) << nsuround << "->" << 2 * (nsuround-2) << " " << flush;
-          do_swap = true;
-          if(check_only) return do_swap;
+          d_badness = badopt-bad1;
+          if(check_only)
+              return d_badness;
 
           for (int k = bestl+1; k <= nsuround + bestl - 2; k++)
             {
@@ -2323,7 +2322,7 @@ bool MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
             }
         }
     }
-  return do_swap;
+  return d_badness;
 }
 
 void MeshOptimize3d :: SwapImprove (Mesh & mesh, OPTIMIZEGOAL goal,
@@ -2373,7 +2372,7 @@ void MeshOptimize3d :: SwapImprove (Mesh & mesh, OPTIMIZEGOAL goal,
   Array<std::tuple<PointIndex,PointIndex>> edges;
   BuildEdgeList(mesh, elementsonnode, edges);
 
-  Array<int> candidate_edges(edges.Size());
+  Array<std::tuple<double, int>> candidate_edges(edges.Size());
   std::atomic<int> improvement_counter(0);
 
   tloop.Start();
@@ -2386,18 +2385,22 @@ void MeshOptimize3d :: SwapImprove (Mesh & mesh, OPTIMIZEGOAL goal,
         break;
 
       auto [pi0, pi1] = edges[i];
-      if(SwapImproveEdge (mesh, goal, working_elements, elementsonnode, faces, pi0, pi1, true))
-        candidate_edges[improvement_counter++] = i;
+      double d_badness = SwapImproveEdge (mesh, goal, working_elements, elementsonnode, faces, pi0, pi1, true);
+      if(d_badness<0.0)
+      {
+        int index = improvement_counter++;
+        candidate_edges[index] = make_tuple(d_badness, i);
+      }
     }
   });
 
   auto edges_with_improvement = candidate_edges.Part(0, improvement_counter.load());
   QuickSort(edges_with_improvement);
 
-  for(auto ei : edges_with_improvement)
+  for(auto [d_badness, ei] : edges_with_improvement)
   {
       auto [pi0,pi1] = edges[ei];
-        if(SwapImproveEdge (mesh, goal, working_elements, elementsonnode, faces, pi0, pi1, false))
+      if(SwapImproveEdge (mesh, goal, working_elements, elementsonnode, faces, pi0, pi1, false) < 0.0)
           cnt++;
   }
 
diff --git a/libsrc/meshing/improve3.hpp b/libsrc/meshing/improve3.hpp
index 21fdcce6..0ddcc484 100644
--- a/libsrc/meshing/improve3.hpp
+++ b/libsrc/meshing/improve3.hpp
@@ -25,7 +25,7 @@ public:
 
   void SplitImprove (Mesh & mesh, OPTIMIZEGOAL goal = OPT_QUALITY);
 
-  bool SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal, const NgBitArray * working_elements, Table<ElementIndex,PointIndex> & elementsonnode, INDEX_3_HASHTABLE<int> & faces, PointIndex pi1, PointIndex pi2, bool check_only=false);
+  double SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal, const NgBitArray * working_elements, Table<ElementIndex,PointIndex> & elementsonnode, INDEX_3_HASHTABLE<int> & faces, PointIndex pi1, PointIndex pi2, bool check_only=false);
   void SwapImprove (Mesh & mesh, OPTIMIZEGOAL goal = OPT_QUALITY,
 		    const NgBitArray * working_elements = NULL);
   void SwapImproveSequential (Mesh & mesh, OPTIMIZEGOAL goal = OPT_QUALITY,
diff --git a/tests/pytest/results.json b/tests/pytest/results.json
index 7699ce00..e8d57ab9 100644
--- a/tests/pytest/results.json
+++ b/tests/pytest/results.json
@@ -73,39 +73,39 @@
             "ne2d": 140,
             "ne3d": 165,
             "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 9, 13, 23, 20, 31, 25, 21, 14, 6, 1]",
-            "total_badness": 233.73328932
+            "total_badness": 233.73328914
         },
         {
             "angles_tet": [
-                24.774,
-                131.74
+                25.801,
+                134.97
             ],
             "angles_trig": [
                 24.858,
-                107.08
+                111.88
             ],
             "ne1d": 181,
             "ne2d": 325,
-            "ne3d": 528,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 19, 38, 53, 74, 80, 99, 85, 63, 9]",
-            "total_badness": 687.31675405
+            "ne3d": 520,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 6, 17, 38, 51, 64, 81, 91, 93, 61, 15]",
+            "total_badness": 673.69458466
         }
     ],
     "boxcyl.geo": [
         {
             "angles_tet": [
-                22.371,
-                139.91
+                22.391,
+                135.51
             ],
             "angles_trig": [
-                22.551,
+                22.547,
                 121.98
             ],
             "ne1d": 190,
             "ne2d": 468,
-            "ne3d": 846,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 31, 93, 78, 103, 80, 92, 103, 102, 84, 56, 21]",
-            "total_badness": 1229.0231928
+            "ne3d": 845,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 29, 90, 89, 74, 95, 96, 93, 98, 99, 60, 21]",
+            "total_badness": 1218.9142866
         },
         {
             "angles_tet": [
@@ -118,86 +118,86 @@
             ],
             "ne1d": 94,
             "ne2d": 114,
-            "ne3d": 157,
-            "quality_histogram": "[0, 0, 0, 0, 0, 1, 3, 8, 13, 13, 15, 7, 12, 11, 19, 14, 12, 21, 5, 3]",
-            "total_badness": 260.17372209
+            "ne3d": 151,
+            "quality_histogram": "[0, 0, 0, 0, 0, 1, 1, 6, 12, 13, 7, 5, 10, 6, 18, 23, 15, 23, 9, 2]",
+            "total_badness": 235.71475569
         },
         {
             "angles_tet": [
-                15.799,
-                159.93
+                16.335,
+                150.13
             ],
             "angles_trig": [
-                16.585,
-                144.56
+                22.011,
+                118.9
             ],
             "ne1d": 136,
             "ne2d": 222,
-            "ne3d": 386,
-            "quality_histogram": "[0, 0, 0, 1, 2, 3, 2, 7, 8, 15, 16, 36, 36, 59, 53, 55, 58, 19, 15, 1]",
-            "total_badness": 590.51625062
+            "ne3d": 376,
+            "quality_histogram": "[0, 0, 0, 0, 0, 1, 0, 2, 2, 6, 20, 29, 32, 62, 63, 67, 49, 24, 17, 2]",
+            "total_badness": 538.32692177
         },
         {
             "angles_tet": [
-                22.38,
-                139.62
+                22.392,
+                135.93
             ],
             "angles_trig": [
-                22.552,
+                22.547,
                 121.98
             ],
             "ne1d": 190,
             "ne2d": 468,
-            "ne3d": 833,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 32, 89, 78, 83, 86, 83, 106, 103, 89, 62, 21]",
-            "total_badness": 1200.9010008
+            "ne3d": 838,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 30, 88, 87, 63, 105, 87, 95, 98, 101, 59, 24]",
+            "total_badness": 1206.145501
         },
         {
             "angles_tet": [
-                25.378,
-                140.35
+                26.449,
+                140.15
             ],
             "angles_trig": [
-                26.299,
-                121.05
+                24.477,
+                114.57
             ],
             "ne1d": 284,
             "ne2d": 938,
-            "ne3d": 3742,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 25, 55, 131, 247, 484, 640, 754, 710, 529, 161]",
-            "total_badness": 4685.7832014
+            "ne3d": 3808,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 12, 47, 117, 277, 497, 641, 782, 746, 506, 177]",
+            "total_badness": 4753.2608817
         },
         {
             "angles_tet": [
-                25.096,
-                141.93
+                28.77,
+                136.82
             ],
             "angles_trig": [
-                27.282,
-                118.08
+                24.852,
+                123.15
             ],
             "ne1d": 456,
             "ne2d": 2496,
-            "ne3d": 18713,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 10, 39, 127, 338, 795, 1684, 2888, 4053, 4409, 3223, 1146]",
-            "total_badness": 22695.778021
+            "ne3d": 18753,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 32, 96, 275, 747, 1627, 2885, 4041, 4511, 3355, 1181]",
+            "total_badness": 22636.690026
         }
     ],
     "circle_on_cube.geo": [
         {
             "angles_tet": [
-                19.311,
-                150.68
+                21.273,
+                137.67
             ],
             "angles_trig": [
-                23.838,
-                115.5
+                24.517,
+                113.53
             ],
             "ne1d": 94,
             "ne2d": 170,
-            "ne3d": 637,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 0, 4, 5, 18, 38, 54, 74, 84, 109, 110, 73, 55, 12]",
-            "total_badness": 863.74076861
+            "ne3d": 631,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 5, 12, 30, 55, 76, 104, 120, 97, 70, 49, 10]",
+            "total_badness": 851.6214528
         },
         {
             "angles_tet": [
@@ -212,159 +212,159 @@
             "ne2d": 38,
             "ne3d": 46,
             "quality_histogram": "[0, 0, 0, 0, 0, 2, 2, 4, 8, 8, 6, 7, 5, 1, 2, 1, 0, 0, 0, 0]",
-            "total_badness": 97.323158335
+            "total_badness": 97.323158326
         },
         {
             "angles_tet": [
-                24.281,
-                134.61
+                26.568,
+                131.32
             ],
             "angles_trig": [
-                23.344,
-                115.83
+                23.604,
+                115.75
             ],
             "ne1d": 62,
             "ne2d": 96,
             "ne3d": 196,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 8, 8, 27, 34, 42, 33, 20, 9, 6, 1]",
-            "total_badness": 282.75693303
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 8, 13, 31, 32, 43, 33, 18, 6, 9, 0]",
+            "total_badness": 281.47956507
         },
         {
             "angles_tet": [
-                25.358,
-                135.05
+                27.256,
+                136.88
             ],
             "angles_trig": [
-                23.767,
-                114.14
+                25.056,
+                112.86
             ],
             "ne1d": 94,
             "ne2d": 170,
-            "ne3d": 622,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 12, 26, 39, 80, 70, 113, 112, 93, 62, 10]",
-            "total_badness": 821.68699443
+            "ne3d": 617,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 8, 24, 45, 83, 93, 110, 109, 75, 54, 12]",
+            "total_badness": 818.76482812
         },
         {
             "angles_tet": [
-                24.582,
-                136.66
+                28.642,
+                131.64
             ],
             "angles_trig": [
-                27.209,
-                113.64
+                27.582,
+                112.81
             ],
             "ne1d": 138,
             "ne2d": 384,
-            "ne3d": 2028,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 9, 28, 67, 157, 250, 347, 419, 398, 261, 88]",
-            "total_badness": 2540.7133216
+            "ne3d": 1988,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 11, 49, 142, 225, 336, 439, 417, 280, 85]",
+            "total_badness": 2458.7297408
         },
         {
             "angles_tet": [
-                22.092,
-                143.64
+                26.261,
+                136.67
             ],
             "angles_trig": [
-                24.9,
-                120.59
+                24.333,
+                115.58
             ],
             "ne1d": 224,
             "ne2d": 944,
-            "ne3d": 11860,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 4, 8, 29, 85, 211, 518, 1135, 1851, 2527, 2686, 2118, 688]",
-            "total_badness": 14411.259826
+            "ne3d": 11879,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 15, 66, 190, 486, 1113, 1774, 2543, 2771, 2231, 685]",
+            "total_badness": 14361.247834
         }
     ],
     "cone.geo": [
         {
             "angles_tet": [
-                13.924,
-                150.81
+                13.001,
+                151.67
             ],
             "angles_trig": [
-                15.502,
-                125.18
+                18.841,
+                121.55
             ],
             "ne1d": 64,
             "ne2d": 722,
-            "ne3d": 1263,
-            "quality_histogram": "[0, 0, 0, 0, 0, 3, 4, 14, 48, 62, 95, 129, 141, 162, 163, 145, 107, 112, 61, 17]",
-            "total_badness": 1927.4650748
+            "ne3d": 1273,
+            "quality_histogram": "[0, 0, 0, 0, 0, 2, 6, 15, 38, 56, 96, 131, 135, 153, 162, 152, 136, 115, 62, 14]",
+            "total_badness": 1925.8714141
         },
         {
             "angles_tet": [
-                7.1839,
-                166.08
+                9.8354,
+                165.47
             ],
             "angles_trig": [
-                7.6255,
-                154.84
+                11.866,
+                146.87
             ],
             "ne1d": 32,
             "ne2d": 220,
-            "ne3d": 700,
-            "quality_histogram": "[0, 0, 13, 49, 51, 51, 51, 46, 63, 42, 38, 49, 53, 50, 42, 33, 27, 21, 18, 3]",
-            "total_badness": 1807.5903418
+            "ne3d": 682,
+            "quality_histogram": "[0, 0, 3, 6, 27, 29, 43, 59, 57, 69, 78, 72, 47, 60, 28, 31, 30, 24, 12, 7]",
+            "total_badness": 1446.4542095
         },
         {
             "angles_tet": [
-                1.7643,
-                174.36
+                2.1733,
+                172.69
             ],
             "angles_trig": [
-                6.9619,
-                160.4
+                6.6643,
+                162.43
             ],
             "ne1d": 48,
             "ne2d": 428,
-            "ne3d": 930,
-            "quality_histogram": "[6, 33, 75, 70, 53, 52, 44, 63, 73, 77, 65, 88, 62, 37, 46, 30, 20, 21, 15, 0]",
-            "total_badness": 3263.5820874
+            "ne3d": 923,
+            "quality_histogram": "[6, 19, 49, 47, 58, 49, 52, 62, 83, 82, 70, 88, 52, 49, 61, 32, 23, 28, 11, 2]",
+            "total_badness": 2830.4770758
         },
         {
             "angles_tet": [
-                14.168,
-                149.33
+                17.241,
+                144.22
             ],
             "angles_trig": [
-                18.275,
-                123.81
+                17.777,
+                121.5
             ],
             "ne1d": 64,
             "ne2d": 722,
-            "ne3d": 1244,
-            "quality_histogram": "[0, 0, 0, 0, 0, 1, 2, 10, 25, 61, 77, 117, 140, 158, 172, 138, 144, 118, 66, 15]",
-            "total_badness": 1843.7405821
+            "ne3d": 1246,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 11, 23, 42, 90, 110, 129, 162, 174, 152, 136, 131, 67, 18]",
+            "total_badness": 1823.124854
         },
         {
             "angles_tet": [
-                19.863,
-                144.26
+                17.406,
+                142.43
             ],
             "angles_trig": [
-                22.797,
-                126.63
+                19.91,
+                123.02
             ],
             "ne1d": 96,
             "ne2d": 1660,
-            "ne3d": 4395,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 2, 14, 39, 86, 147, 270, 427, 584, 724, 725, 723, 492, 162]",
-            "total_badness": 5745.9242938
+            "ne3d": 4458,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 2, 8, 32, 70, 131, 272, 410, 628, 728, 793, 731, 514, 139]",
+            "total_badness": 5796.7549854
         },
         {
             "angles_tet": [
-                23.928,
-                143.79
+                22.764,
+                140.56
             ],
             "angles_trig": [
-                23.981,
-                123.07
+                27.263,
+                120.46
             ],
             "ne1d": 160,
             "ne2d": 4748,
-            "ne3d": 27365,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 8, 35, 121, 352, 715, 1535, 2882, 4456, 5703, 5878, 4303, 1377]",
-            "total_badness": 33766.111622
+            "ne3d": 27254,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 4, 16, 71, 235, 659, 1375, 2774, 4392, 5618, 6099, 4470, 1540]",
+            "total_badness": 33350.665768
         }
     ],
     "cube.geo": [
@@ -430,23 +430,23 @@
         },
         {
             "angles_tet": [
-                28.058,
-                136.51
+                27.354,
+                136.27
             ],
             "angles_trig": [
-                23.62,
-                124.99
+                21.671,
+                126.93
             ],
             "ne1d": 48,
             "ne2d": 36,
             "ne3d": 57,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 2, 12, 14, 4, 12, 2, 2, 3, 0]",
-            "total_badness": 84.416883473
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 1, 10, 12, 9, 12, 4, 1, 2, 0]",
+            "total_badness": 83.840161698
         },
         {
             "angles_tet": [
                 21.865,
-                138.69
+                136.72
             ],
             "angles_trig": [
                 22.37,
@@ -454,46 +454,46 @@
             ],
             "ne1d": 72,
             "ne2d": 116,
-            "ne3d": 167,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 4, 2, 5, 5, 16, 8, 18, 30, 31, 29, 11, 7]",
-            "total_badness": 224.7322738
+            "ne3d": 169,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 3, 3, 4, 8, 13, 12, 20, 28, 33, 27, 11, 6]",
+            "total_badness": 228.41837612
         }
     ],
     "cubeandring.geo": [
         {
             "angles_tet": [
-                2.8878,
-                174.5
+                5.0886,
+                168.15
             ],
             "angles_trig": [
-                10.113,
+                11.704,
                 150.46
             ],
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\ No newline at end of file