diff --git a/TODO.taskpaper b/TODO.taskpaper
--- a/TODO.taskpaper
+++ b/TODO.taskpaper
@@ -186,6 +186,7 @@
 			Drawing each tile individually is very silly when it's just a (big) square anyway.
 			For edges: Using a dictionary with counts doesn't work either. (~5 fps) Nor using sets.
 			Instead need to do the fill and edge-drawing as large regions.
+		- Draw slows down after merely leaving it running
 	Structural improvements:
 		- Button to clear/thin debug buffers?
 			Take every nth to reduce counters to past 100 measurements
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
@@ -61,6 +61,7 @@
     TimeSpan tileDrawTime = TimeSpan.Zero;
     TimeSpan gridDrawTime = TimeSpan.Zero;
     TimeSpan treeDrawTime = TimeSpan.Zero;
+    TimeSpan rendererDrawTime = TimeSpan.Zero;
     TimeSpan updateTime = TimeSpan.Zero;
     TimeSpan worldUpdateTime = TimeSpan.Zero;
     TimeSpan simulationUpdateTime = TimeSpan.Zero;
@@ -763,44 +764,6 @@
             this.gridDrawTime = stopWatch2.Elapsed;
             #endregion draw_gridlines
 
-            //Gridlines
-            //Lines going down and to the right:
-            /*
-                        for (int x = (int)(-this.squaresAcross/2); x < this.squaresAcross; x++)
-                {
-                    int rowOffset = 0;
-
-                    float startX = (x * Tile.TileStepX) + baseOffsetX - (Tile.TileStepX / 2);
-
-                    Vector2 start = new Vector2(startX, -baseOffsetY+4);
-                    Vector2 stop = new Vector2(startX + this.squaresAcross* Tile.TileStepX/2,
-                        this.squaresDown*Tile.TileStepY- baseOffsetY+4);
-
-
-
-                    Line.drawLine(batch,
-                        Line.departurePoint(stop, start, this.squaresAcross * Tile.TileWidth, this.squaresDown * Tile.TileHeight),
-                        Line.departurePoint(start, stop, this.squaresAcross * Tile.TileWidth, this.squaresDown * Tile.TileHeight),
-                        Color.White, 0.8f);
-
-                }
-                //Lines going down and to the left:
-                for (int x = 0; x < (int)(1.5*this.squaresAcross); x++)
-                {
-
-                    float startX = (x * Tile.TileStepX) + baseOffsetX - (Tile.TileStepX / 2);
-
-                    Vector2 start_reverse = new Vector2(startX, -baseOffsetY + 4);
-                    Vector2 stop_reverse = new Vector2(startX + -(this.squaresAcross * Tile.TileStepX / 2),
-                        (this.squaresDown * Tile.TileStepY) - baseOffsetY + 4);
-
-                    Line.drawLine(batch,
-                        Line.departurePoint(stop_reverse, start_reverse, this.squaresAcross * Tile.TileWidth, this.squaresDown * Tile.TileHeight),
-                        Line.departurePoint(start_reverse, stop_reverse, this.squaresAcross * Tile.TileWidth, this.squaresDown * Tile.TileHeight),
-                        Color.White, 0.8f);
-
-                }
-                */
             tileBatch.Begin(SpriteSortMode.BackToFront,
                     BlendState.AlphaBlend,
                     null,
@@ -890,9 +853,13 @@
             drawTileAt(3, 2, 140, 2);
 #endif
 
+            stopWatch2 = new Stopwatch();
+            stopWatch2.Start();
             World.Draw();
             // _imGuiRenderer.AfterLayout();
             tileBatch.End();
+            stopWatch2.Stop();
+            this.rendererDrawTime = stopWatch2.Elapsed;
 
             #region draw_header
             batch.Begin(SpriteSortMode.BackToFront,
@@ -1053,6 +1020,7 @@
             treeDrawTime = this.treeDrawTime,
             gridDrawTime = this.gridDrawTime,
             tileDrawTime = this.tileDrawTime,
+            rendererDrawTime = this.rendererDrawTime,
             updateTime = this.updateTime,
             worldUpdateTime = this.worldUpdateTime,
             simulationUpdateTime = this.simulationUpdateTime,
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
@@ -19,6 +19,7 @@
         public TimeSpan treeDrawTime;
         public TimeSpan gridDrawTime;
         public TimeSpan tileDrawTime;
+        public TimeSpan rendererDrawTime;
         public Vector2 cameraPosition;
         public int treeCount;
         public Vector2 mouseGrid;
@@ -226,10 +227,11 @@
 
                         ImGui.Text(string.Format("fps: {0:F3}", debugInfo.fps));
                         ImGui.Text(string.Format("Draw Time: {0:F3}", debugInfo.drawTime.TotalMilliseconds.ToString()));
-                        ImGui.Text(string.Format("\tTree: {0:F3}; Grid: {1:F3}; Tile: {2:F3}",
+                        ImGui.Text(string.Format("\tTree: {0,7:F3}; Grid: {1,7:F3}; Tile: {2,7:F3}\n\t Renderer: {3,7:F3}",
                                                  debugInfo.treeDrawTime.TotalMilliseconds.ToString(),
                                                  debugInfo.gridDrawTime.TotalMilliseconds.ToString(),
-                                                 debugInfo.tileDrawTime.TotalMilliseconds.ToString()));
+                                                 debugInfo.tileDrawTime.TotalMilliseconds.ToString(),
+                                                 debugInfo.rendererDrawTime.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(),