diff --git a/htroot/WatchWebStructure_p.html b/htroot/WatchWebStructure_p.html
index c71e8f312..a67797766 100644
--- a/htroot/WatchWebStructure_p.html
+++ b/htroot/WatchWebStructure_p.html
@@ -28,29 +28,29 @@
 <dl>
 	<dt>host</dt>
 	<dd>
-		<input type="text" value="#[host]#" name="host" id="host" size="20" maxlength="80" />
+	  <input type="text" value="#[host]#" name="host" id="host" size="20" maxlength="80" />
 	</dd>
 	<dt>depth</dt>
 	<dd>
-	<a href="WatchWebStructure_p.html?host=#[host]#&depth=#[depthd]#&width=#[width]#&height=#[height]#&nodes=#[nodes]#"><img src="env/grafics/minus.gif" /></a>
-	<input type="text" name="depth" value="#[depth]#" size="1" maxlength="1" />
-    <a href="WatchWebStructure_p.html?host=#[host]#&depth=#[depthi]#&width=#[width]#&height=#[height]#&nodes=#[nodes]#"><img src="env/grafics/plus.gif" /></a>
+	  <a href="WatchWebStructure_p.html?host=#[host]#&depth=#[depthd]#&width=#[width]#&height=#[height]#&nodes=#[nodes]#&time=#[time]#"><img src="env/grafics/minus.gif" /></a>
+	  <input type="text" name="depth" value="#[depth]#" size="1" maxlength="1" />
+      <a href="WatchWebStructure_p.html?host=#[host]#&depth=#[depthi]#&width=#[width]#&height=#[height]#&nodes=#[nodes]#&time=#[time]#"><img src="env/grafics/plus.gif" /></a>
 	</dd>
-	<dt>size</dt>
-	<dd><input type="text" name="width" value="#[width]#" size="4" maxlength="4" />&nbsp;x&nbsp;<input type="text" name="height" value="#[height]#" size="4" maxlength="4" /></dd>
-    <dt>nodes</dt>
+	<dt>nodes</dt>
 	<dd>
-		<a href="WatchWebStructure_p.html?host=#[host]#&depth=#[depth]#&width=#[width]#&height=#[height]#&nodes=#[nodesd]#"><img src="env/grafics/minus.gif" /></a>
-		<input type="text" name="nodes" value="#[nodes]#" size="4" maxlength="4" />
-	    <a href="WatchWebStructure_p.html?host=#[host]#&depth=#[depth]#&width=#[width]#&height=#[height]#&nodes=#[nodesi]#"><img src="env/grafics/plus.gif" /></a>
-		</dd>
+	  <a href="WatchWebStructure_p.html?host=#[host]#&depth=#[depth]#&width=#[width]#&height=#[height]#&nodes=#[nodesd]#&time=#[time]#"><img src="env/grafics/minus.gif" /></a>
+	  <input type="text" name="nodes" value="#[nodes]#" size="4" maxlength="4" />
+	  <a href="WatchWebStructure_p.html?host=#[host]#&depth=#[depth]#&width=#[width]#&height=#[height]#&nodes=#[nodesi]#&time=#[time]#"><img src="env/grafics/plus.gif" /></a>
+	</dd>
+    <dt>size</dt>
+	<dd><input type="text" name="width" value="#[width]#" size="4" maxlength="4" />&nbsp;x&nbsp;<input type="text" name="height" value="#[height]#" size="4" maxlength="4" /></dd>
     <dt>&nbsp;</dt>
     <dd><input type="submit" value="change" /></dd>
 </dl>
 </form>
 </div>
 
-<img src="WebStructurePicture_p.png?host=#[host]#&depth=#[depth]#&width=#[width]#&height=#[height]#&nodes=#[nodes]#" />
+<img src="WebStructurePicture_p.png?host=#[host]#&depth=#[depth]#&width=#[width]#&height=#[height]#&nodes=#[nodes]#&time=#[time]#" />
 
 #%env/templates/footer.template%# 
 </body>
diff --git a/htroot/WatchWebStructure_p.java b/htroot/WatchWebStructure_p.java
index af1aae41e..48c75a5df 100644
--- a/htroot/WatchWebStructure_p.java
+++ b/htroot/WatchWebStructure_p.java
@@ -17,6 +17,7 @@ public class WatchWebStructure_p {
         int height = 576;
         int depth = 3;
         int nodes = 100; // maximum number of host nodes that are painted
+        int time = -1;
         String host = "auto";
         
         if (post != null) {
@@ -24,6 +25,7 @@ public class WatchWebStructure_p {
             height = post.getInt("height", 576);
             depth = post.getInt("depth", 3);
             nodes = post.getInt("nodes", width * height * 100 / 768 / 576);
+            time = post.getInt("time", -1);
             host = post.get("host", "auto");
         }
         
@@ -50,6 +52,7 @@ public class WatchWebStructure_p {
         prop.put("width", width);
         prop.put("height", height);
         prop.put("nodes", nodes);
+        prop.put("time", time);
         prop.put("nodesi", Math.min(1000, nodes + 50));
         prop.put("nodesd", Math.max(0, nodes - 50));
         
diff --git a/htroot/WebStructurePicture_p.java b/htroot/WebStructurePicture_p.java
index c10bf2ae6..cdbba77fe 100644
--- a/htroot/WebStructurePicture_p.java
+++ b/htroot/WebStructurePicture_p.java
@@ -51,6 +51,7 @@ public class WebStructurePicture_p {
         int height = 576;
         int depth = 3;
         int nodes = 100; // maximum number of host nodes that are painted
+        int time = -1;
         String host = null;
         
         if (post != null) {
@@ -58,6 +59,7 @@ public class WebStructurePicture_p {
             height = post.getInt("height", 576);
             depth = post.getInt("depth", 3);
             nodes = post.getInt("nodes", width * height * 100 / 768 / 576);
+            time = post.getInt("time", -1);
             host = post.get("host", null);
         }
         
@@ -69,6 +71,9 @@ public class WebStructurePicture_p {
         if (depth > 8) depth = 8;
         if (depth < 0) depth = 0;
         
+        // calculate target time
+        long timeout = (time < 0) ? Long.MAX_VALUE : System.currentTimeMillis() + time;
+        
         // find start point
         if ((host == null) || (host.length() == 0) || (host.equals("auto"))) {
             // find domain with most references
@@ -83,14 +88,14 @@ public class WebStructurePicture_p {
         
         // recursively find domains, up to a specific depth
         ymageGraph graph = new ymageGraph();
-        if (host != null) place(graph, sb.webStructure, hash, host, nodes, 0.0, 0.0, 0, depth);
+        if (host != null) place(graph, sb.webStructure, hash, host, nodes, timeout, 0.0, 0.0, 0, depth);
         //graph.print();
         
         return graph.draw(width, height, 40, 40, 5, 15);
         
     }
     
-    private static final int place(ymageGraph graph, plasmaWebStructure structure, String centerhash, String centerhost, int maxnodes, double x, double y, int nextlayer, int maxlayer) {
+    private static final int place(ymageGraph graph, plasmaWebStructure structure, String centerhash, String centerhost, int maxnodes, long timeout, double x, double y, int nextlayer, int maxlayer) {
         // returns the number of nodes that had been placed
         assert centerhost != null;
         ymageGraph.coordinate center = graph.getPoint(centerhost);
@@ -112,7 +117,7 @@ public class WebStructurePicture_p {
         int maxtargetrefs = 8, maxthisrefs = 8;
         int targetrefs, thisrefs;
         double rr, re;
-        while ((i.hasNext()) && (maxnodes > 0)) {
+        while ((i.hasNext()) && (maxnodes > 0) && (System.currentTimeMillis() < timeout)) {
             entry = (Map.Entry) i.next();
             targethash = (String) entry.getKey();
             targethost = structure.resolveDomHash2DomString(targethash);
@@ -142,7 +147,7 @@ public class WebStructurePicture_p {
             targethost = target[1];
             ymageGraph.coordinate c = graph.getPoint(targethost);
             assert c != null;
-            nextnodes = (maxnodes <= 0) ? 0 : place(graph, structure, targethash, targethost, maxnodes, c.x, c.y, nextlayer, maxlayer);
+            nextnodes = ((maxnodes <= 0) || (System.currentTimeMillis() >= timeout)) ? 0 : place(graph, structure, targethash, targethost, maxnodes, timeout, c.x, c.y, nextlayer, maxlayer);
             mynodes += nextnodes;
             maxnodes -= nextnodes;
             graph.setBorder(centerhost, targethost);
diff --git a/htroot/env/templates/header.template b/htroot/env/templates/header.template
index 2a767eb0c..042251866 100644
--- a/htroot/env/templates/header.template
+++ b/htroot/env/templates/header.template
@@ -25,7 +25,7 @@
     <h3>Monitoring</h3>
     <ul class="menu">
       <li><a href="/Network.html" accesskey="w" class="MenuItemLink">YaCy Network</a></li>
-      <li><a href="/WatchWebStructure_p.html?host=auto&depth=2" class="MenuItemLink lock">Crawl Activity</a></li>
+      <li><a href="/WatchWebStructure_p.html?host=auto&depth=2&time=1000" class="MenuItemLink lock">Crawl Activity</a></li>
       <li><a href="/IndexMonitor.html" class="MenuItemLink">Crawl Results</a></li>
       <li><a href="/SearchStatistics_p.html" class="MenuItemLink lock">Search Statistics</a></li>
       <li><a href="/ViewLog_p.html" class="MenuItemLink lock">Server Log</a></li>
diff --git a/source/de/anomic/plasma/plasmaWebStructure.java b/source/de/anomic/plasma/plasmaWebStructure.java
index 7bd9447dd..3380f1e8e 100644
--- a/source/de/anomic/plasma/plasmaWebStructure.java
+++ b/source/de/anomic/plasma/plasmaWebStructure.java
@@ -33,8 +33,9 @@ import java.util.ConcurrentModificationException;
 import java.util.Date;
 import java.util.Iterator;
 import java.util.Map;
-import java.util.SortedMap;
+import java.util.HashMap;
 import java.util.TreeMap;
+import java.util.SortedMap;
 
 import de.anomic.kelondro.kelondroBase64Order;
 import de.anomic.net.URL;
@@ -155,9 +156,9 @@ public class plasmaWebStructure {
         return (refs.length() - 8) / 10;
     }
     
-    private static TreeMap refstr2map(String refs) {
-        if ((refs == null) || (refs.length() <= 8)) return new TreeMap();
-        TreeMap map = new TreeMap();
+    private static Map refstr2map(String refs) {
+        if ((refs == null) || (refs.length() <= 8)) return new HashMap();
+        Map map = new HashMap();
         String c;
         int refsc = refstr2count(refs);
         for (int i = 0; i < refsc; i++) {
@@ -167,7 +168,7 @@ public class plasmaWebStructure {
         return map;
     }
     
-    private static String map2refstr(TreeMap map) {
+    private static String map2refstr(Map map) {
         StringBuffer s = new StringBuffer(map.size() * 10);
         s.append(plasmaURL.shortDayFormatter.format(new Date()));
         Iterator i = map.entrySet().iterator();
@@ -194,16 +195,16 @@ public class plasmaWebStructure {
         return s.toString();
     }
     
-    public TreeMap references(String domhash) {
+    public Map references(String domhash) {
         // returns a map with a domhash(String):refcount(Integer) relation
         assert domhash.length() == 6;
         SortedMap tailMap = structure.tailMap(domhash);
-        if ((tailMap == null) || (tailMap.size() == 0)) return new TreeMap();
+        if ((tailMap == null) || (tailMap.size() == 0)) return new HashMap();
         String key = (String) tailMap.firstKey();
         if (key.startsWith(domhash)) {
             return refstr2map((String) tailMap.get(key));
         } else {
-            return new TreeMap();
+            return new HashMap();
         }
     }
     
@@ -244,7 +245,7 @@ public class plasmaWebStructure {
         String domhash = plasmaURL.urlHash(url).substring(6);
 
         // parse the new reference string and join it with the stored references
-        TreeMap refs = references(domhash);
+        Map refs = references(domhash);
         assert reference.length() % 12 == 0;
         String dom;
         int c;