diff --git a/src/Triangle.Examples/Examples/Example1.cs b/src/Triangle.Examples/Examples/Example1.cs
index 2dbaa63..202dd7a 100644
--- a/src/Triangle.Examples/Examples/Example1.cs
+++ b/src/Triangle.Examples/Examples/Example1.cs
@@ -25,7 +25,7 @@ namespace TriangleNet.Examples
             // Generate mesh.
             var mesh = mesher.Triangulate(points);
 
-            if (print) SvgImage.Save(mesh, "example-1.png", 500);
+            if (print) SvgImage.Save(mesh, "example-1.svg", 500);
         }
     }
 }
diff --git a/src/Triangle.Examples/Examples/Example10.cs b/src/Triangle.Examples/Examples/Example10.cs
new file mode 100644
index 0000000..9f6dc16
--- /dev/null
+++ b/src/Triangle.Examples/Examples/Example10.cs
@@ -0,0 +1,96 @@
+
+namespace TriangleNet.Examples
+{
+    using System;
+    using System.Collections.Concurrent;
+    using System.IO;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using TriangleNet;
+    using TriangleNet.IO;
+    using TriangleNet.Meshing;
+
+    /// <summary>
+    /// Processing meshes in parallel.
+    /// </summary>
+    public class Example10
+    {
+        /// <summary>
+        /// Reads all .poly files from given directory and processes them in parallel.
+        /// </summary>
+        public static void Run(string dir)
+        {
+            var files = Directory.EnumerateFiles(dir, "*.poly", SearchOption.AllDirectories);
+
+            var queue = new ConcurrentQueue<string>(files);
+
+            int concurrencyLevel = Environment.ProcessorCount / 2;
+
+            var tasks = new Task<MeshResult>[concurrencyLevel];
+
+            for (int i = 0; i < concurrencyLevel; i++)
+            {
+                tasks[i] = Task.Run(() =>
+                {
+                    // Each task has it's own triangle pool and predicates instance.
+                    var pool = new TrianglePool();
+                    var predicates = new RobustPredicates();
+
+                    // The factory methods return the above instances.
+                    var config = new Configuration()
+                    {
+                        Predicates = () => predicates,
+                        TrianglePool = () => pool.Restart()
+                    };
+
+                    var mesher = new GenericMesher(config);
+                    var result = new MeshResult();
+
+                    while (queue.Count > 0)
+                    {
+                        if (queue.TryDequeue(out var file))
+                        {
+                            var poly = FileProcessor.Read(file);
+
+                            var mesh = mesher.Triangulate(poly);
+
+                            ProcessMesh(mesh, result);
+                        }
+                    }
+
+                    pool.Clear();
+
+                    return result;
+                });
+            }
+
+            Task.WaitAll(tasks);
+
+            int numberOfTriangles = tasks.Sum(t => t.Result.NumberOfTriangles);
+            int invalid = tasks.Sum(t => t.Result.Invalid);
+
+            Console.WriteLine("Total number of triangles processed: {0}", numberOfTriangles);
+
+            if (invalid > 0)
+            {
+                Console.WriteLine("   Number of invalid triangulations: {0}", invalid);
+            }
+        }
+
+        private static void ProcessMesh(IMesh mesh, MeshResult result)
+        {
+            result.NumberOfTriangles += mesh.Triangles.Count;
+
+            if (!MeshValidator.IsConsistent((Mesh)mesh))
+            {
+                result.Invalid += 1;
+            }
+        }
+
+        class MeshResult
+        {
+            public int NumberOfTriangles;
+            public int Invalid;
+        }
+    }
+}
diff --git a/src/Triangle.Examples/Examples/Example2.cs b/src/Triangle.Examples/Examples/Example2.cs
index 351d360..b973c03 100644
--- a/src/Triangle.Examples/Examples/Example2.cs
+++ b/src/Triangle.Examples/Examples/Example2.cs
@@ -20,7 +20,7 @@
             // Generate mesh using the polygons Triangulate extension method.
             var mesh = poly.Triangulate(quality);
 
-            if (print) SvgImage.Save(mesh, "example-2.png", 500);
+            if (print) SvgImage.Save(mesh, "example-2.svg", 500);
         }
 
         public static IPolygon CreatePolygon(double h = 0.2)
diff --git a/src/Triangle.Examples/Examples/Example3.cs b/src/Triangle.Examples/Examples/Example3.cs
index fbf3750..f8520b2 100644
--- a/src/Triangle.Examples/Examples/Example3.cs
+++ b/src/Triangle.Examples/Examples/Example3.cs
@@ -17,7 +17,7 @@ namespace TriangleNet.Examples
             // Generate mesh.
             var mesh = CreateMesh();
 
-            if (print) SvgImage.Save(mesh, "example-3.png", 500);
+            if (print) SvgImage.Save(mesh, "example-3.svg", 500);
         }
 
         public static IMesh CreateMesh()
diff --git a/src/Triangle.Examples/Examples/Example4.cs b/src/Triangle.Examples/Examples/Example4.cs
index 449eb4b..c69f09c 100644
--- a/src/Triangle.Examples/Examples/Example4.cs
+++ b/src/Triangle.Examples/Examples/Example4.cs
@@ -41,7 +41,7 @@ namespace TriangleNet.Examples
 
             smoother.Smooth(mesh, 5);
 
-            if (print) SvgImage.Save(mesh, "example-4.png", 500);
+            if (print) SvgImage.Save(mesh, "example-4.svg", 500);
         }
 
         public static IPolygon CreatePolygon()
diff --git a/src/Triangle.Examples/Examples/Example5.cs b/src/Triangle.Examples/Examples/Example5.cs
index a38529c..acd8fc1 100644
--- a/src/Triangle.Examples/Examples/Example5.cs
+++ b/src/Triangle.Examples/Examples/Example5.cs
@@ -19,11 +19,11 @@ namespace TriangleNet.Examples
 
             FindBoundary1(mesh);
 
-            if (print) SvgImage.Save(mesh, "example-5-1.png", 500, true, false);
+            if (print) SvgImage.Save(mesh, "example-5-1.svg", 500, true, false);
 
             FindBoundary2(mesh);
 
-            if (print) SvgImage.Save(mesh, "example-5-2.png", 500, true, false);
+            if (print) SvgImage.Save(mesh, "example-5-2.svg", 500, true, false);
         }
 
         /// <summary>
diff --git a/src/Triangle.Examples/Examples/Example6.cs b/src/Triangle.Examples/Examples/Example6.cs
index d114eca..2d18c47 100644
--- a/src/Triangle.Examples/Examples/Example6.cs
+++ b/src/Triangle.Examples/Examples/Example6.cs
@@ -8,11 +8,11 @@
     using TriangleNet.Topology;
 
     /// <summary>
-    /// Boolean operation on mesh regions (intersection, difference, xor).
+    /// Boolean operations on mesh regions (intersection, difference, xor).
     /// </summary>
     public static class Example6
     {
-        public static void Run() //FindRegions()
+        public static void Run()
         {
             // Generate the input geometry.
             var polygon = new Polygon(8, true);
diff --git a/src/Triangle.Examples/Examples/Example9.cs b/src/Triangle.Examples/Examples/Example9.cs
index 93d4a53..9b24aa7 100644
--- a/src/Triangle.Examples/Examples/Example9.cs
+++ b/src/Triangle.Examples/Examples/Example9.cs
@@ -72,8 +72,11 @@ namespace TriangleNet.Examples
                 double x = p.X;
                 double y = p.Y;
 
-                double xr = Math.Cos(radians) * x - Math.Sin(radians) * y;
-                double yr = Math.Sin(radians) * x + Math.Cos(radians) * y;
+                double s = Math.Sin(radians);
+                double c = Math.Cos(radians);
+
+                double xr = c * x - s * y;
+                double yr = s * x + c * y;
 
                 poly.Points.Add(new Vertex(xr, yr) { ID = id++ });
             }