diff --git a/src/DotRecast.Core/CollectionExtensions.cs b/src/DotRecast.Core/CollectionExtensions.cs
index 1dd0173..cb6e1e7 100644
--- a/src/DotRecast.Core/CollectionExtensions.cs
+++ b/src/DotRecast.Core/CollectionExtensions.cs
@@ -5,6 +5,28 @@ namespace DotRecast.Core
 {
     public static class CollectionExtensions
     {
+        /// Sorts the given data in-place using insertion sort.
+
+        ///
+        /// @param	data		The data to sort
+        /// @param	dataLength	The number of elements in @p data
+        public static void InsertSort(this int[] data)
+        {
+            for (int valueIndex = 1; valueIndex < data.Length; valueIndex++)
+            {
+                int value = data[valueIndex];
+                int insertionIndex;
+                for (insertionIndex = valueIndex - 1; insertionIndex >= 0 && data[insertionIndex] > value; insertionIndex--)
+                {
+                    // Shift over values
+                    data[insertionIndex + 1] = data[insertionIndex];
+                }
+		
+                // Insert the value in sorted order.
+                data[insertionIndex + 1] = value;
+            }
+        }
+            
         public static void ForEach<T>(this IEnumerable<T> collection, Action<T> action)
         {
             foreach (var item in collection)
diff --git a/src/DotRecast.Recast/RecastArea.cs b/src/DotRecast.Recast/RecastArea.cs
index a9d1daf..4751bee 100644
--- a/src/DotRecast.Recast/RecastArea.cs
+++ b/src/DotRecast.Recast/RecastArea.cs
@@ -319,7 +319,8 @@ namespace DotRecast.Recast
                             }
                         }
 
-                        Array.Sort(neighborAreas);
+                        //Array.Sort(neighborAreas);
+                        neighborAreas.InsertSort();
                         areas[spanIndex] = neighborAreas[4];
                     }
                 }