diff --git a/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex.cs b/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex.cs
index 03657b8f..2beb3952 100644
--- a/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex.cs
+++ b/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex.cs
@@ -2062,13 +2062,7 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
             for (var j = 0; j < columnsB; j++)
             {
                 var jm = j*rowsA;
-                CommonParallel.For(0, rowsA, (u, v) =>
-                    {
-                        for (int k = u; k < v; k++)
-                        {
-                            column[k] = sol[jm + k];
-                        }
-                    });
+                Array.Copy(sol, jm, column, 0, rowsA);
                 CommonParallel.For(0, columnsA, (u, v) =>
                     {
                         for (int i = u; i < v; i++)
diff --git a/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex32.cs b/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex32.cs
index abdfd52c..9add9980 100644
--- a/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex32.cs
+++ b/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex32.cs
@@ -2058,14 +2058,8 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
             var column = new Complex32[rowsA];
             for (var j = 0; j < columnsB; j++)
             {
-                var jm = j*rowsA;
-                CommonParallel.For(0, rowsA, (u, v) =>
-                    {
-                        for (int k = u; k < v; k++)
-                        {
-                            column[k] = sol[jm + k];
-                        }
-                    });
+                var jm = j * rowsA;
+                Array.Copy(sol, jm, column, 0, rowsA);
                 CommonParallel.For(0, columnsA, (u, v) =>
                     {
                         for (int i = u; i < v; i++)
diff --git a/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Double.cs b/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Double.cs
index 8e920154..b18e700f 100644
--- a/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Double.cs
+++ b/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Double.cs
@@ -1946,14 +1946,8 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
             var column = new double[rowsA];
             for (var j = 0; j < columnsB; j++)
             {
-                var jm = j*rowsA;
-                CommonParallel.For(0, rowsA, (u, v) =>
-                    {
-                        for (int k = u; k < v; k++)
-                        {
-                            column[k] = sol[jm + k];
-                        }
-                    });
+                var jm = j * rowsA;
+                Array.Copy(sol, jm, column, 0, rowsA);
                 CommonParallel.For(0, columnsA, (u, v) =>
                     {
                         for (int i = u; i < v; i++)
diff --git a/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Single.cs b/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Single.cs
index 4fe5a27a..0e32efa7 100644
--- a/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Single.cs
+++ b/src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Single.cs
@@ -1948,14 +1948,8 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
             var column = new float[rowsA];
             for (var j = 0; j < columnsB; j++)
             {
-                var jm = j*rowsA;
-                CommonParallel.For(0, rowsA, (u, v) =>
-                    {
-                        for (int k = u; k < v; k++)
-                        {
-                            column[k] = sol[jm + k];
-                        }
-                    });
+                var jm = j * rowsA;
+                Array.Copy(sol, jm, column, 0, rowsA);
                 CommonParallel.For(0, columnsA, (u, v) =>
                     {
                         for (int i = u; i < v; i++)