diff --git a/isometric-park-fna/Engines/SimulationBridgeEngine.cs b/isometric-park-fna/Engines/SimulationBridgeEngine.cs
--- a/isometric-park-fna/Engines/SimulationBridgeEngine.cs
+++ b/isometric-park-fna/Engines/SimulationBridgeEngine.cs
@@ -114,8 +114,8 @@
             {
 
 #region calculate_preserve_cells
-	    var preserve_cells = new HashSet<isometricparkfna.CellMap.Cell>();
-	    var preserve_cell_coordinates = new HashSet<(int, int)>();
+	    // var preserve_cells = new HashSet<isometricparkfna.CellMap.Cell>();
+	    var preserve_cell_coordinates = new List<(int, int)>();
 	    var count = 0;
 
 	    Stopwatch iterPreserves = new Stopwatch();
@@ -125,7 +125,7 @@
 		ref readonly var areaComponent = ref GetComponent<AreaComponent>(entity);
 
 		foreach (var square in areaComponent.squares) {
-			preserve_cells.Add(this.simulation.map.cells[(int)square.X][(int)square.Y]);
+			// preserve_cells.Add(this.simulation.map.cells[(int)square.X][(int)square.Y]);
 			preserve_cell_coordinates.Add(((int)square.X, (int)square.Y));
 		}
 	    }
@@ -156,14 +156,10 @@
 	    //*
 	     foreach ((var x, var y) in preserve_cell_coordinates) {
 		    foreach ((var newx, var newy) in this.simulation.map.iterate_neighbor_cell_locations(x, y)) {
-
 			    this.simulation.PreserveCounts[newx, newy]  += 1;
 		    }
-
 	    }
 	    //*/
-	    
-
 	    iterCells.Stop();
 	    Logging.Info(String.Format("Cell loop: {0:F3}", iterCells.Elapsed.TotalMilliseconds.ToString()));