diff --git a/src/main/java/org/dynmap/Event.java b/src/main/java/org/dynmap/Event.java
index f387d978..5d3acd81 100644
--- a/src/main/java/org/dynmap/Event.java
+++ b/src/main/java/org/dynmap/Event.java
@@ -1,21 +1,31 @@
 package org.dynmap;
 
+import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
 
 public class Event<T> {
     private List<Listener<T>> listeners = new LinkedList<Listener<T>>();
+    private Object lock = new Object();
 
-    public synchronized void addListener(Listener<T> l) {
-        listeners.add(l);
+    public void addListener(Listener<T> l) {
+        synchronized(lock) {
+            listeners.add(l);
+        }
     }
 
-    public synchronized void removeListener(Listener<T> l) {
-        listeners.remove(l);
+    public void removeListener(Listener<T> l) {
+        synchronized(lock) {
+            listeners.remove(l);
+        }
     }
 
-    public synchronized void trigger(T t) {
-        for (Listener<T> l : listeners) {
+    public void trigger(T t) {
+        ArrayList<Listener<T>> iterlist;
+        synchronized(lock) {
+            iterlist = new ArrayList<Listener<T>>(listeners);
+        }
+        for (Listener<T> l : iterlist) {
             l.triggered(t);
         }
     }
diff --git a/src/main/java/org/dynmap/MapManager.java b/src/main/java/org/dynmap/MapManager.java
index 41626997..7eadbed3 100644
--- a/src/main/java/org/dynmap/MapManager.java
+++ b/src/main/java/org/dynmap/MapManager.java
@@ -188,6 +188,7 @@ public class MapManager {
                     found.clear();
                     rendered.clear();
                     rendercnt = 0;
+                    timeaccum = 0;
                     map_index++;    /* Next map */
                     if(map_index >= world.maps.size()) {    /* Last one done? */
                         sender.sendMessage("Full render of '" + world.world.getName() + "' finished.");
diff --git a/src/main/java/org/dynmap/TileHashManager.java b/src/main/java/org/dynmap/TileHashManager.java
index 1c6f3e24..1191bfdb 100644
--- a/src/main/java/org/dynmap/TileHashManager.java
+++ b/src/main/java/org/dynmap/TileHashManager.java
@@ -2,11 +2,11 @@ package org.dynmap;
 import java.io.File;
 import java.io.RandomAccessFile;
 import java.util.Arrays;
-import java.util.LinkedHashMap;
-import java.util.Map;
 import java.io.IOException;
 import java.util.zip.CRC32;
 
+import org.dynmap.utils.LRULinkedHashMap;
+
 /**
  * Image hash code manager - used to reduce compression and notification of updated tiles that do not actually yield new content
  *
@@ -97,17 +97,6 @@ public class TileHashManager {
         }
     }
     
-    public static class LRULinkedHashMap<T, K> extends LinkedHashMap<T, K> {
-        private int limit;
-        public LRULinkedHashMap(int lim) {
-            super(16, (float)0.75, true);
-            limit = lim;
-        }
-        protected boolean removeEldestEntry(Map.Entry<T, K> last) {
-            return(size() >= limit);
-        }
-    }
-    
     private static final int MAX_CACHED_TILEHASHFILES = 25;
     private Object lock = new Object();
     private LRULinkedHashMap<TileHashFile, byte[]> tilehash = new LRULinkedHashMap<TileHashFile, byte[]>(MAX_CACHED_TILEHASHFILES);
diff --git a/src/main/java/org/dynmap/utils/LRULinkedHashMap.java b/src/main/java/org/dynmap/utils/LRULinkedHashMap.java
new file mode 100644
index 00000000..62fbd88b
--- /dev/null
+++ b/src/main/java/org/dynmap/utils/LRULinkedHashMap.java
@@ -0,0 +1,15 @@
+package org.dynmap.utils;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class LRULinkedHashMap<T, K> extends LinkedHashMap<T, K> {
+    private int limit;
+    public LRULinkedHashMap(int lim) {
+        super(16, (float)0.75, true);
+        limit = lim;
+    }
+    protected boolean removeEldestEntry(Map.Entry<T, K> last) {
+        return(size() >= limit);
+    }
+}