diff --git a/src/main/java/org/dynmap/AsynchronousQueue.java b/src/main/java/org/dynmap/AsynchronousQueue.java
index de6bb44c..c84207ad 100644
--- a/src/main/java/org/dynmap/AsynchronousQueue.java
+++ b/src/main/java/org/dynmap/AsynchronousQueue.java
@@ -16,12 +16,15 @@ public class AsynchronousQueue<T> {
     private int dequeueTime;
     private int accelDequeueTime;
     private int accelDequeueThresh;
+    private int pendingcnt;
+    private int pendinglimit;
     
-    public AsynchronousQueue(Handler<T> handler, int dequeueTime, int accelDequeueThresh, int accelDequeueTime) {
+    public AsynchronousQueue(Handler<T> handler, int dequeueTime, int accelDequeueThresh, int accelDequeueTime, int pendinglimit) {
         this.handler = handler;
         this.dequeueTime = dequeueTime;
         this.accelDequeueTime = accelDequeueTime;
         this.accelDequeueThresh = accelDequeueThresh;
+        this.pendinglimit = pendinglimit;
     }
 
     public boolean push(T t) {
@@ -42,6 +45,16 @@ public class AsynchronousQueue<T> {
             return t;
         }
     }
+    
+    public boolean remove(T t) {
+        synchronized (lock) {
+            if (set.remove(t)) {
+                queue.remove(t);
+            	return true;
+            }
+        }
+        return false;
+    }
 
     public int size() {
         return set.size();
@@ -95,8 +108,23 @@ public class AsynchronousQueue<T> {
     private void running() {
         try {
             while (Thread.currentThread() == thread) {
+            	synchronized(lock) {
+            		while(pendingcnt >= pendinglimit) {
+            			try {
+            				lock.wait(accelDequeueTime);
+            			} catch (InterruptedException ix) {
+            				if(Thread.currentThread() != thread)
+            					return;
+            				throw ix;
+            			}
+            		}
+            	}
                 T t = pop();
                 if (t != null) {
+                	synchronized(lock) {
+                		pendingcnt++;
+                	}
+                	Log.info("handle(" + t + ")");
                     handler.handle(t);
                 }
                 if(set.size() >= accelDequeueThresh)
@@ -118,4 +146,12 @@ public class AsynchronousQueue<T> {
         }
         return true;
     }
+    
+    public void done(T t) {
+    	Log.info("done(" + t + ")");
+        synchronized (lock) {
+        	if(pendingcnt > 0) pendingcnt--;
+        	lock.notifyAll();
+        }
+    }
 }
diff --git a/src/main/java/org/dynmap/MapManager.java b/src/main/java/org/dynmap/MapManager.java
index 7507218b..319fcb8d 100644
--- a/src/main/java/org/dynmap/MapManager.java
+++ b/src/main/java/org/dynmap/MapManager.java
@@ -207,6 +207,7 @@ public class MapManager {
         FullWorldRenderState(MapTile t) {
             world = getWorld(t.getWorld().getName());
             tile0 = t;
+            Log.info("job(" + t + ")");
             cxmin = czmin = Integer.MIN_VALUE;
             cxmax = czmax = Integer.MAX_VALUE;
         }
@@ -315,6 +316,9 @@ public class MapManager {
                     active_renders.remove(world.world.getName());
                 }
             }
+            else {
+                tileQueue.done(tile0);            	
+            }
         }
         public void run() {
             long tstart = System.currentTimeMillis();
@@ -506,6 +510,8 @@ public class MapManager {
                     tile.render(cache, null);
             }
             else {
+        		/* Remove tile from tile queue, since we're processing it already */
+            	tileQueue.remove(tile);
                 /* Switch to not checking if rendered tile is blank - breaks us on skylands, where tiles can be nominally blank - just work off chunk cache empty */
                 if (cache.isEmpty() == false) {
                     tile.render(cache, mapname);
@@ -626,7 +632,7 @@ public class MapManager {
             }, 
             (int) (configuration.getDouble("renderinterval", 0.5) * 1000),
             configuration.getInteger("renderacceleratethreshold", 30),
-            (int)(configuration.getDouble("renderaccelerateinterval", 0.2) * 1000));
+            (int)(configuration.getDouble("renderaccelerateinterval", 0.2) * 1000), 1);
 
         /* On dedicated thread, so default to no delays */
         timeslice_int = (long)(configuration.getDouble("timesliceinterval", 0.0) * 1000);
@@ -1121,6 +1127,10 @@ public class MapManager {
                            ", updated=" + tot.updatedcnt + ", transparent=" + tot.transparentcnt);
         sender.sendMessage("  Cache hit rate: " + sscache.getHitRate() + "%");
         sender.sendMessage("  Triggered update queue size: " + tileQueue.size());
+        String act = "";
+        for(String wn : active_renders.keySet())
+        	act += wn + " ";
+        sender.sendMessage("  Active render jobs: " + act);
     }
     /**
      * Reset statistics