diff --git a/src/roadtrip/model/AbstractProceduralBlock.java b/src/roadtrip/model/AbstractProceduralBlock.java
index f7d445d..2ecebef 100644
--- a/src/roadtrip/model/AbstractProceduralBlock.java
+++ b/src/roadtrip/model/AbstractProceduralBlock.java
@@ -1,5 +1,6 @@
 package roadtrip.model;
 
+import com.jme3.terrain.geomipmap.LRUCache;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 import java.util.Random;
@@ -11,6 +12,8 @@ public abstract class AbstractProceduralBlock implements ProceduralBlock
 {
 	private long seed;
 
+        private LRUCache<String, ProceduralBlock> subBlocksCache = new LRUCache<>(getSubBlocksCacheSize());
+        
 	public AbstractProceduralBlock(long seed)
 	{
 		this.seed = seed;
@@ -38,13 +41,24 @@ public abstract class AbstractProceduralBlock implements ProceduralBlock
 	public <T extends ProceduralBlock> T getSubBlock(String subBlockKey, Class<T> subBlockClass)
 	{
 		if (subBlockClass == null) throw new NullPointerException("subBlockClass");
+                T result = (T) subBlocksCache.get(subBlockKey);
+                if (result != null) {
+                    return result;
+                }
 		try {
 			Constructor<T> constructor = subBlockClass.getConstructor(Long.TYPE);
-			return constructor.newInstance(getSubBlockSeed(subBlockKey));
+			result = constructor.newInstance(getSubBlockSeed(subBlockKey));
+                        subBlocksCache.put(subBlockKey, result);
+                        return result;
 		} catch (NoSuchMethodException e) {
 			throw new IllegalArgumentException("Class " + subBlockClass + " does not have the default constructor with a single 'long' parameter.", e);
 		} catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
 			throw new IllegalArgumentException("Unable to instantiate sub-block.", e);
 		}
 	}
+
+    public int getSubBlocksCacheSize()
+    {
+        return 8;
+    }
 }
diff --git a/src/roadtrip/model/ProceduralMapQuadBlock.java b/src/roadtrip/model/ProceduralMapQuadBlock.java
index 8fd1caa..62360c6 100644
--- a/src/roadtrip/model/ProceduralMapQuadBlock.java
+++ b/src/roadtrip/model/ProceduralMapQuadBlock.java
@@ -32,7 +32,7 @@ public class ProceduralMapQuadBlock extends AbstractProceduralBlock
 		Random quadRand = getBlockRandom();
 		Vector2f prevPos = null;
 		Vector2f quadPos = new Vector2f(terrainQuad.getLocalTranslation().x, terrainQuad.getLocalTranslation().z);
-		for (int i = 0; i < quadRand.nextInt(10000); i++) {
+		for (int i = 0; i < quadRand.nextInt(100); i++) {
 			Vector2f pos;
 			if (prevPos == null || quadRand.nextFloat() < 0.2f) {
 				pos = new Vector2f((quadRand.nextFloat() - 0.5f) * cellSize, (quadRand.nextFloat() - 0.5f) * cellSize)
diff --git a/src/roadtrip/view/FineTerrainGrid.java b/src/roadtrip/view/FineTerrainGrid.java
index ec33b5b..860b9ee 100644
--- a/src/roadtrip/view/FineTerrainGrid.java
+++ b/src/roadtrip/view/FineTerrainGrid.java
@@ -421,15 +421,15 @@ public class FineTerrainGrid extends TerrainQuad {
         int xMax = getSubdivisionsPerSide();
         int yMin = 0;
         int yMax = getSubdivisionsPerSide();
-        if (dx == -1) { // camera moved to -X direction
+        if (dx < 0) { // camera moved to -X direction
             xMax = getSubdivisionsPerSide() - 1;
-        } else if (dx == 1) { // camera moved to +X direction
+        } else if (dx > 0) { // camera moved to +X direction
             xMin = 1;
         }
 
-        if (dy == -1) { // camera moved to -Y direction
+        if (dy < 0) { // camera moved to -Y direction
             yMax = getSubdivisionsPerSide() - 1;
-        } else if (dy == 1) { // camera moved to +Y direction
+        } else if (dy > 0) { // camera moved to +Y direction
             yMin = 1;
         }
 
diff --git a/src/roadtrip/view/GameWorldView.java b/src/roadtrip/view/GameWorldView.java
index 49f9161..d807bb6 100644
--- a/src/roadtrip/view/GameWorldView.java
+++ b/src/roadtrip/view/GameWorldView.java
@@ -36,7 +36,7 @@ import roadtrip.view.model.GameWorldState;
  */
 public class GameWorldView {
 
-    public static boolean DEBUG = true;
+    public static boolean DEBUG = false;//true;
     
     private final GameWorldState state;
 
@@ -184,8 +184,7 @@ public class GameWorldView {
 
                 String quadObjectsNodeKey = getQuadObjectsNodeKey(quad);
                 Node objects = new Node(quadObjectsNodeKey);
-                // TODO: fix
-                //populateQuadObjectsNode(quad, objects);
+                populateQuadObjectsNode(quad, objects);
                 rootNode.attachChild(objects);
             }