diff --git a/libsrc/meshing/improve2.cpp b/libsrc/meshing/improve2.cpp
index 4c6ec4a3..e0efde2a 100644
--- a/libsrc/meshing/improve2.cpp
+++ b/libsrc/meshing/improve2.cpp
@@ -375,26 +375,40 @@ namespace netgen
   
 
 
+    Array<std::pair<SurfaceElementIndex,int>> improvement_candidates(3*seia.Size());
+    atomic<int> cnt(0);
+
     int t = 4;
     bool done = false;
     while (!done && t >= 2)
       {
-	for (int i = 0; i < seia.Size(); i++)
-	  {
-	    SurfaceElementIndex t1 = seia[i];
+        cnt = 0;
+        ParallelForRange( Range(seia), [&] (auto myrange)
+          {
+            for (auto i : myrange)
+              {
+                SurfaceElementIndex t1 = seia[i];
 
-	    if (mesh[t1].IsDeleted())
-	      continue;
+                if (mesh[t1].IsDeleted())
+                  continue;
 
-	    if (mesh[t1].GetIndex() != faceindex)
-	      continue;
+                if (mesh[t1].GetIndex() != faceindex)
+                  continue;
 
-	    if (multithread.terminate)
-	      throw NgException ("Meshing stopped");
+                if (multithread.terminate)
+                  throw NgException ("Meshing stopped");
 
-	    for (int o1 = 0; o1 < 3; o1++)
-                done |= EdgeSwapping(mesh, usemetric, neighbors, swapped, t1, o1, surfnr, t, pdef, false);
-	  }
+                for (int o1 = 0; o1 < 3; o1++)
+                    if(EdgeSwapping(mesh, usemetric, neighbors, swapped, t1, o1, surfnr, t, pdef, true))
+                        improvement_candidates[cnt++]= std::make_pair(t1,o1);
+              }
+          });
+
+        auto elements_with_improvement = improvement_candidates.Range(cnt.load());
+        QuickSort(elements_with_improvement);
+
+        for (auto [t1,o1] : elements_with_improvement)
+            done |= EdgeSwapping(mesh, usemetric, neighbors, swapped, t1, o1, surfnr, t, pdef, false);
 	t--;
       }
 
diff --git a/tests/pytest/results.json b/tests/pytest/results.json
index 4a1bcf12..79f56322 100644
--- a/tests/pytest/results.json
+++ b/tests/pytest/results.json
@@ -3,9 +3,9 @@
         {
             "ne1d": 74,
             "ne2d": 54,
-            "ne3d": 50,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 5, 8, 13, 3, 9, 5, 0, 1, 1]",
-            "total_badness": 74.774553826
+            "ne3d": 40,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 7, 16, 1, 5, 2, 0, 0, 0]",
+            "total_badness": 61.085020201
         },
         {
             "ne1d": 59,
@@ -24,32 +24,32 @@
         {
             "ne1d": 74,
             "ne2d": 54,
-            "ne3d": 50,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 5, 8, 13, 3, 9, 5, 0, 1, 1]",
-            "total_badness": 74.77454941
+            "ne3d": 40,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 7, 16, 1, 5, 2, 0, 0, 0]",
+            "total_badness": 61.085020201
         },
         {
             "ne1d": 118,
             "ne2d": 140,
             "ne3d": 165,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 5, 13, 13, 25, 31, 25, 20, 17, 12, 1]",
-            "total_badness": 228.72078637
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 9, 13, 23, 20, 31, 24, 22, 14, 6, 1]",
+            "total_badness": 233.73391407
         },
         {
             "ne1d": 181,
             "ne2d": 323,
-            "ne3d": 507,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 9, 20, 35, 56, 56, 81, 90, 83, 59, 15]",
-            "total_badness": 661.00817809
+            "ne3d": 513,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 6, 15, 34, 56, 67, 96, 86, 86, 46, 18]",
+            "total_badness": 667.61850419
         }
     ],
     "boxcyl.geo": [
         {
             "ne1d": 190,
             "ne2d": 468,
-            "ne3d": 858,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 31, 91, 73, 79, 87, 106, 114, 102, 89, 66, 18]",
-            "total_badness": 1232.0426735
+            "ne3d": 846,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 4, 30, 91, 78, 91, 92, 93, 102, 104, 80, 59, 22]",
+            "total_badness": 1226.0578147
         },
         {
             "ne1d": 94,
@@ -61,39 +61,39 @@
         {
             "ne1d": 136,
             "ne2d": 222,
-            "ne3d": 384,
-            "quality_histogram": "[0, 0, 1, 0, 3, 3, 3, 6, 11, 17, 21, 28, 34, 44, 68, 64, 49, 19, 11, 2]",
-            "total_badness": 598.99833044
+            "ne3d": 381,
+            "quality_histogram": "[0, 0, 0, 0, 0, 2, 4, 3, 7, 15, 16, 27, 38, 51, 68, 67, 49, 17, 16, 1]",
+            "total_badness": 567.29889026
         },
         {
             "ne1d": 190,
             "ne2d": 468,
-            "ne3d": 850,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 29, 87, 73, 75, 86, 106, 97, 112, 87, 75, 21]",
-            "total_badness": 1214.229893
+            "ne3d": 833,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 30, 87, 78, 78, 90, 88, 104, 103, 87, 64, 22]",
+            "total_badness": 1198.1799119
         },
         {
             "ne1d": 284,
-            "ne2d": 938,
-            "ne3d": 3761,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 20, 59, 118, 250, 456, 628, 751, 755, 564, 153]",
-            "total_badness": 4693.1208525
+            "ne2d": 936,
+            "ne3d": 3833,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 17, 53, 160, 270, 442, 625, 795, 755, 544, 165]",
+            "total_badness": 4795.1972581
         },
         {
             "ne1d": 456,
             "ne2d": 2496,
-            "ne3d": 18969,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 5, 8, 15, 43, 130, 353, 876, 1713, 3018, 4122, 4317, 3271, 1098]",
-            "total_badness": 23072.833527
+            "ne3d": 19027,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 2, 6, 16, 41, 134, 386, 861, 1759, 3032, 4100, 4323, 3238, 1129]",
+            "total_badness": 23153.342852
         }
     ],
     "circle_on_cube.geo": [
         {
             "ne1d": 94,
-            "ne2d": 174,
-            "ne3d": 646,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 10, 23, 48, 81, 117, 100, 123, 86, 43, 10]",
-            "total_badness": 859.43881883
+            "ne2d": 170,
+            "ne3d": 634,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 21, 37, 42, 77, 93, 99, 106, 106, 40, 9]",
+            "total_badness": 852.35637426
         },
         {
             "ne1d": 40,
@@ -105,39 +105,39 @@
         {
             "ne1d": 62,
             "ne2d": 94,
-            "ne3d": 182,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 5, 14, 21, 35, 35, 33, 19, 9, 8, 0]",
-            "total_badness": 258.4064329
+            "ne3d": 185,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 7, 12, 31, 26, 37, 27, 19, 14, 8, 0]",
+            "total_badness": 264.64378082
         },
         {
             "ne1d": 94,
-            "ne2d": 174,
-            "ne3d": 621,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 5, 11, 45, 59, 93, 114, 121, 104, 53, 14]",
-            "total_badness": 804.68562065
+            "ne2d": 170,
+            "ne3d": 609,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 4, 9, 28, 31, 67, 80, 97, 121, 106, 53, 12]",
+            "total_badness": 797.71713532
         },
         {
             "ne1d": 138,
             "ne2d": 382,
-            "ne3d": 2054,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 15, 57, 129, 210, 330, 426, 450, 321, 109]",
-            "total_badness": 2526.4427939
+            "ne3d": 2047,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 12, 24, 77, 153, 249, 384, 402, 417, 254, 72]",
+            "total_badness": 2570.7494356
         },
         {
             "ne1d": 224,
-            "ne2d": 944,
-            "ne3d": 11988,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 2, 17, 33, 82, 226, 556, 1140, 1929, 2512, 2801, 2061, 628]",
-            "total_badness": 14608.275962
+            "ne2d": 942,
+            "ne3d": 12152,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 15, 83, 237, 599, 1170, 1934, 2615, 2796, 2123, 572]",
+            "total_badness": 14806.696612
         }
     ],
     "cone.geo": [
         {
             "ne1d": 64,
             "ne2d": 722,
-            "ne3d": 1231,
-            "quality_histogram": "[0, 0, 0, 0, 0, 1, 8, 22, 29, 50, 88, 118, 123, 158, 175, 140, 137, 111, 52, 19]",
-            "total_badness": 1853.3096959
+            "ne3d": 1234,
+            "quality_histogram": "[0, 0, 0, 0, 0, 3, 1, 15, 38, 55, 88, 123, 143, 139, 184, 147, 119, 105, 57, 17]",
+            "total_badness": 1861.257399
         },
         {
             "ne1d": 32,
@@ -156,23 +156,23 @@
         {
             "ne1d": 64,
             "ne2d": 722,
-            "ne3d": 1208,
-            "quality_histogram": "[0, 0, 0, 0, 0, 1, 2, 15, 22, 47, 81, 110, 131, 144, 172, 150, 145, 112, 62, 14]",
-            "total_badness": 1783.4859474
+            "ne3d": 1211,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 2, 8, 20, 59, 82, 118, 147, 128, 167, 157, 135, 108, 65, 15]",
+            "total_badness": 1789.8591485
         },
         {
             "ne1d": 96,
             "ne2d": 1660,
-            "ne3d": 4423,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 4, 35, 88, 158, 276, 400, 584, 726, 802, 735, 464, 150]",
-            "total_badness": 5769.9946848
+            "ne3d": 4464,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 4, 11, 30, 74, 185, 273, 414, 599, 748, 785, 747, 434, 160]",
+            "total_badness": 5840.7208133
         },
         {
             "ne1d": 160,
             "ne2d": 4748,
-            "ne3d": 27126,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 3, 13, 31, 83, 303, 735, 1519, 2944, 4316, 5668, 5807, 4355, 1349]",
-            "total_badness": 33434.663911
+            "ne3d": 27166,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 4, 14, 38, 87, 310, 736, 1515, 2971, 4344, 5642, 5811, 4361, 1333]",
+            "total_badness": 33504.993018
         }
     ],
     "cube.geo": [
@@ -213,54 +213,54 @@
         },
         {
             "ne1d": 72,
-            "ne2d": 118,
-            "ne3d": 184,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 5, 10, 7, 19, 18, 37, 33, 33, 14, 6]",
-            "total_badness": 241.24676972
+            "ne2d": 116,
+            "ne3d": 167,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 4, 2, 5, 5, 16, 8, 18, 30, 31, 29, 12, 6]",
+            "total_badness": 224.72495191
         }
     ],
     "cubeandring.geo": [
         {
             "ne1d": 262,
-            "ne2d": 722,
-            "ne3d": 2188,
-            "quality_histogram": "[1, 9, 25, 36, 90, 100, 108, 114, 90, 73, 63, 100, 149, 190, 251, 264, 241, 168, 96, 20]",
-            "total_badness": 4412.1941358
+            "ne2d": 724,
+            "ne3d": 2220,
+            "quality_histogram": "[3, 13, 18, 47, 87, 95, 119, 121, 98, 68, 86, 122, 167, 187, 216, 243, 225, 169, 111, 25]",
+            "total_badness": 4594.1424775
         },
         {
             "ne1d": 134,
             "ne2d": 162,
-            "ne3d": 252,
-            "quality_histogram": "[0, 0, 0, 0, 0, 1, 1, 2, 1, 3, 8, 24, 28, 49, 38, 41, 29, 19, 7, 1]",
-            "total_badness": 365.81827351
+            "ne3d": 247,
+            "quality_histogram": "[0, 0, 0, 0, 0, 2, 0, 0, 4, 2, 11, 19, 35, 48, 38, 39, 24, 14, 9, 2]",
+            "total_badness": 361.08642754
         },
         {
             "ne1d": 190,
-            "ne2d": 298,
-            "ne3d": 613,
-            "quality_histogram": "[0, 0, 0, 0, 2, 0, 0, 4, 3, 17, 49, 47, 61, 93, 110, 82, 52, 60, 28, 5]",
-            "total_badness": 897.54658869
+            "ne2d": 300,
+            "ne3d": 630,
+            "quality_histogram": "[0, 0, 0, 1, 2, 0, 0, 3, 10, 16, 51, 70, 62, 108, 101, 78, 62, 43, 19, 4]",
+            "total_badness": 945.8223883
         },
         {
             "ne1d": 262,
-            "ne2d": 722,
-            "ne3d": 2054,
-            "quality_histogram": "[0, 3, 12, 28, 61, 84, 109, 97, 80, 55, 48, 68, 112, 166, 245, 277, 249, 212, 116, 32]",
-            "total_badness": 3795.4750393
+            "ne2d": 724,
+            "ne3d": 2075,
+            "quality_histogram": "[0, 3, 10, 24, 70, 91, 119, 86, 82, 50, 48, 83, 125, 169, 212, 265, 273, 210, 123, 32]",
+            "total_badness": 3839.258335
         },
         {
             "ne1d": 378,
             "ne2d": 1412,
-            "ne3d": 7752,
-            "quality_histogram": "[0, 0, 0, 0, 0, 2, 1, 9, 13, 27, 56, 136, 281, 548, 921, 1256, 1534, 1557, 1091, 320]",
-            "total_badness": 9761.7065165
+            "ne3d": 7646,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 2, 9, 19, 60, 144, 300, 559, 885, 1284, 1510, 1488, 1055, 330]",
+            "total_badness": 9628.2237959
         },
         {
             "ne1d": 624,
-            "ne2d": 3942,
-            "ne3d": 38282,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 3, 10, 28, 117, 334, 795, 2026, 3889, 5942, 8057, 8537, 6447, 2097]",
-            "total_badness": 46825.777983
+            "ne2d": 3944,
+            "ne3d": 43287,
+            "quality_histogram": "[0, 0, 0, 0, 2, 40, 194, 422, 757, 1077, 1754, 2592, 3765, 4982, 5953, 6630, 6135, 5003, 3105, 876]",
+            "total_badness": 61333.463425
         }
     ],
     "cubeandspheres.geo": [
@@ -268,131 +268,131 @@
             "ne1d": 144,
             "ne2d": 148,
             "ne3d": 98,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 6, 3, 4, 18, 19, 13, 20, 2, 9, 1, 0]",
-            "total_badness": 145.83375109
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 6, 3, 4, 16, 18, 14, 20, 4, 8, 2, 0]",
+            "total_badness": 145.06570717
         },
         {
             "ne1d": 144,
             "ne2d": 150,
             "ne3d": 100,
             "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 10, 16, 18, 15, 17, 6, 5, 4, 0]",
-            "total_badness": 146.646861
+            "total_badness": 146.6442139
         },
         {
             "ne1d": 144,
             "ne2d": 148,
             "ne3d": 98,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 6, 6, 19, 21, 12, 18, 5, 4, 4, 0]",
-            "total_badness": 145.14580662
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 6, 6, 17, 20, 14, 18, 5, 6, 3, 0]",
+            "total_badness": 144.34810104
         },
         {
             "ne1d": 144,
             "ne2d": 148,
             "ne3d": 98,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 6, 3, 4, 18, 19, 13, 20, 2, 9, 1, 0]",
-            "total_badness": 145.83375109
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 3, 6, 3, 4, 16, 18, 14, 20, 4, 8, 2, 0]",
+            "total_badness": 145.06570717
         },
         {
             "ne1d": 264,
-            "ne2d": 386,
-            "ne3d": 365,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 2, 6, 24, 31, 43, 39, 53, 35, 44, 51, 28, 9, 0]",
-            "total_badness": 553.03362076
+            "ne2d": 388,
+            "ne3d": 366,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 2, 4, 21, 28, 39, 47, 52, 37, 58, 40, 25, 10, 2]",
+            "total_badness": 550.46676248
         },
         {
             "ne1d": 428,
-            "ne2d": 930,
-            "ne3d": 1080,
-            "quality_histogram": "[0, 0, 0, 0, 0, 1, 2, 19, 59, 37, 100, 136, 100, 123, 162, 160, 66, 65, 28, 22]",
-            "total_badness": 1684.1500639
+            "ne2d": 926,
+            "ne3d": 1075,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 2, 24, 51, 37, 103, 144, 97, 121, 156, 155, 71, 61, 31, 22]",
+            "total_badness": 1676.2336937
         }
     ],
     "cubemcyl.geo": [
         {
             "ne1d": 142,
-            "ne2d": 2488,
-            "ne3d": 20940,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 22, 78, 213, 367, 738, 1237, 1875, 2588, 3120, 3314, 3117, 2521, 1385, 365]",
-            "total_badness": 29036.424267
+            "ne2d": 2490,
+            "ne3d": 20799,
+            "quality_histogram": "[0, 0, 0, 0, 0, 3, 28, 79, 219, 382, 656, 1158, 1775, 2464, 3005, 3406, 3192, 2557, 1522, 353]",
+            "total_badness": 28706.828456
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         {
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-            "ne3d": 3203,
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-            "total_badness": 4539.3174908
+            "ne3d": 3229,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 12, 32, 67, 160, 255, 358, 490, 500, 493, 420, 301, 113, 27]",
+            "total_badness": 4623.4755628
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         {
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-            "total_badness": 11848.69595
+            "ne2d": 1402,
+            "ne3d": 8204,
+            "quality_histogram": "[0, 0, 0, 0, 0, 1, 8, 22, 59, 164, 348, 591, 842, 1045, 1356, 1225, 1109, 817, 472, 145]",
+            "total_badness": 11539.42633
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         {
             "ne1d": 142,
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-            "total_badness": 25605.226153
+            "ne2d": 2490,
+            "ne3d": 19461,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 9, 29, 93, 229, 518, 1070, 1941, 2741, 3474, 3670, 3200, 1969, 518]",
+            "total_badness": 25234.660253
         },
         {
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             "ne2d": 5508,
-            "ne3d": 88843,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 23, 113, 364, 946, 2450, 5445, 10022, 14690, 18368, 18746, 13521, 4155]",
-            "total_badness": 109927.85826
+            "ne3d": 88594,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 4, 31, 113, 362, 1035, 2435, 5625, 9861, 14712, 18443, 18771, 13294, 3908]",
+            "total_badness": 109777.71823
         },
         {
             "ne1d": 362,
-            "ne2d": 15120,
-            "ne3d": 521218,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 25, 119, 374, 1224, 3269, 9296, 24328, 50521, 82283, 109285, 119759, 91721, 29013]",
-            "total_badness": 633985.71695
+            "ne2d": 15116,
+            "ne3d": 520770,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 4, 25, 134, 437, 1202, 3273, 9236, 24185, 50863, 82792, 109294, 119384, 91342, 28599]",
+            "total_badness": 633693.0884
         }
     ],
     "cubemsphere.geo": [
         {
             "ne1d": 90,
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\ No newline at end of file