diff --git a/isometric-park-fna/FNAGame.cs b/isometric-park-fna/FNAGame.cs
--- a/isometric-park-fna/FNAGame.cs
+++ b/isometric-park-fna/FNAGame.cs
@@ -62,6 +62,8 @@
     TimeSpan gridDrawTime = TimeSpan.Zero;
     TimeSpan treeDrawTime = TimeSpan.Zero;
     TimeSpan updateTime = TimeSpan.Zero;
+    TimeSpan worldUpdateTime = TimeSpan.Zero;
+    TimeSpan simulationUpdateTime = TimeSpan.Zero;
 
     Queue<float> past_fps = new Queue<float>(100);
     Queue<TimeSpan> past_draw = new Queue<TimeSpan>(100);
@@ -479,6 +481,7 @@
     protected override void Update(GameTime gameTime)
     {
         Stopwatch stopWatch = new Stopwatch();
+        Stopwatch stopWatch2 = new Stopwatch();
         stopWatch.Start();
 
 #if DEBUG
@@ -504,8 +507,16 @@
         #endregion misc_keys
         #endregion input
 
+        stopWatch2.Start();
         World.Update(gameTime.ElapsedGameTime.TotalSeconds);
+        stopWatch2.Stop();
+        this.worldUpdateTime = stopWatch2.Elapsed;
+
+        stopWatch2 = new Stopwatch();
+        stopWatch2.Start();
         this.simulation.update(gameTime.ElapsedGameTime);
+        stopWatch2.Stop();
+        this.simulationUpdateTime = stopWatch2.Elapsed;
 
         if (this.showBudget)
         {
@@ -976,6 +987,8 @@
             gridDrawTime = this.gridDrawTime,
             tileDrawTime = this.tileDrawTime,
             updateTime = this.updateTime,
+            worldUpdateTime = this.worldUpdateTime,
+            simulationUpdateTime = this.simulationUpdateTime,
             treeCount = this.simulation.map.tree_count,
             mouseGrid = this.mouseGrid,
             hasTree = has_tree,
diff --git a/isometric-park-fna/UI/DebugWindow.cs b/isometric-park-fna/UI/DebugWindow.cs
--- a/isometric-park-fna/UI/DebugWindow.cs
+++ b/isometric-park-fna/UI/DebugWindow.cs
@@ -26,6 +26,9 @@
         public Boolean hasTree;
         public int tilesDrawn;
         public TimeSpan updateTime;
+		public TimeSpan worldUpdateTime;
+		public TimeSpan simulationUpdateTime;
+
     }
 
     public class DebugWindow
@@ -232,6 +235,9 @@
                                                  debugInfo.gridDrawTime.TotalMilliseconds.ToString(),
                                                  debugInfo.tileDrawTime.TotalMilliseconds.ToString()));
                         ImGui.Text(string.Format("Update Time: {0:F3}", debugInfo.updateTime.TotalMilliseconds.ToString()));
+                        ImGui.Text(string.Format("\tWorld: {0:F3}; Simulation: {1:F3}",
+									debugInfo.worldUpdateTime.TotalMilliseconds.ToString(),
+									debugInfo.simulationUpdateTime.TotalMilliseconds.ToString()));
                         ImGui.Text(string.Format("Tiles Drawn: {0:F}", debugInfo.tilesDrawn));