minimise window.Draw() calls using a RenderTexture, improving performance

Program.cs

@@ -22,11 +22,16 @@ namespace game
 			g.entityList.Add(new ball_t(25f, new Vector2f(300, 100), new Vector2f(.2f, .2f)));
 			g.entityList.Add(new ball_t(25f, new Vector2f(200, 100), new Vector2f(.2f, .2f)));
 
+
 			while (window.IsOpen)
 			{
 				window.DispatchEvents();
-				window.Clear();
 				g.entityList.Run(window);
+				g.renderTexture.Display();
+				window.Clear();
+				Sprite sprite = new Sprite(g.renderTexture.Texture);
+				window.Draw(sprite);
+				g.renderTexture.Clear();
 				window.Display();
 			}
 		}

ball.cs

@@ -47,7 +47,7 @@ namespace game
 				this.velocity /= 2f;
 				this.shape.Position += new Vector2f(0, -.1F);
 				this.shape.Position = new Vector2f(Math.Clamp(this.shape.Position.X, 0, 1280), Math.Clamp(this.shape.Position.Y, 0, 720));
-				Console.WriteLine("COLLISION: "+this.velocity.Y.ToString());
+				//Console.WriteLine("COLLISION: "+this.velocity.Y.ToString());
 			}
 			Vector2f oldPosition = this.shape.Position;
 			this.shape.Position += this.velocity;
@@ -67,7 +67,7 @@ namespace game
 		public void Run(RenderWindow window)
 		{
 			RunPhysics(new Vector2f(0f, .0001f));
-			window.Draw(this.shape);
+			g.renderTexture.Draw(this.shape);
 		}
 	}
 }

collisionHandler.cs

@@ -22,6 +22,15 @@ namespace game
 		{
 			return (float)Math.Sqrt(v.X * v.X + v.Y * v.Y);
 		}
+		public static float TEMP_vecDist(Vector2f v, Vector2f v2)
+		{
+			Vector2f delta = new Vector2f();
+
+			delta.X = v.X - v2.X;
+			delta.X = v.Y - v2.Y;
+
+			return TEMP_vecLen(delta);
+		}
 		public static List<ball_t> registry = new List<ball_t>();
 
 		public static collision_t isColliding(ball_t ball)

entityList.cs

@@ -6,7 +6,7 @@ using game;
 
 namespace game
 {
-	class entityList : List<ball_t>
+	class entityList_t : List<ball_t>
 	{
 		public void Run(RenderWindow window)
 		{

globals.cs

@@ -13,6 +13,7 @@ namespace game
 	{
 		public static mouse_t mouse = new mouse_t();
 		public static Random rand = new Random();
-		public static entityList entityList = new entityList();
+		public static entityList_t entityList = new entityList_t();
+		public static RenderTexture renderTexture = new RenderTexture(1280, 720);
 	}
 }