diff --git a/source/de/anomic/kelondro/kelondroBLOBHeap.java b/source/de/anomic/kelondro/kelondroBLOBHeap.java
index 5584bc4d3..1297a4fc3 100755
--- a/source/de/anomic/kelondro/kelondroBLOBHeap.java
+++ b/source/de/anomic/kelondro/kelondroBLOBHeap.java
@@ -33,6 +33,7 @@ import java.util.Iterator;
 import java.util.Map;
 import java.util.SortedMap;
 import java.util.TreeMap;
+import java.util.concurrent.ExecutionException;
 
 import de.anomic.server.serverMemory;
 import de.anomic.server.logging.serverLog;
@@ -79,13 +80,14 @@ public final class kelondroBLOBHeap implements kelondroBLOB {
         this.ordering = ordering;
         this.heapFile = heapFile;
         
-        this.index = new kelondroBytesLongMap(keylength, this.ordering, 0);
+        this.index = null; // will be created as result of initialization process
         this.free = new TreeMap<Long, Integer>();
         this.file = new RandomAccessFile(heapFile, "rw");
-        final byte[] key = new byte[keylength];
+        byte[] key = new byte[keylength];
         int reclen;
         long seek = 0;
-
+        kelondroBytesLongMap.initDataConsumer indexready = kelondroBytesLongMap.asynchronusInitializer(keylength, this.ordering, 0, Math.max(10, (int) (Runtime.getRuntime().freeMemory() / (10 * 1024 * 1024))));
+        
         loop: while (true) { // don't test available() here because this does not work for files > 2GB
             
             try {
@@ -115,21 +117,17 @@ public final class kelondroBLOBHeap implements kelondroBLOB {
                 // it is an empty record, store to free list
                 if (reclen > 0) free.put(seek, reclen);
             } else {
-                // store key and access address of entry in index
-                try {
-                    if (this.ordering.wellformed(key)) {
-                        index.addl(key, seek);
-                    } else {
-                        serverLog.logWarning("kelondroBLOBHeap", "BLOB " + heapFile.getName() + ": skiped not wellformed key " + new String(key) + " at seek pos " + seek);
-                    }
-                } catch (final IOException e) {
-                    e.printStackTrace();
-                    break loop;
+                if (this.ordering.wellformed(key)) {
+                    indexready.consume(key, seek);
+                    key = new byte[keylength];
+                } else {
+                    serverLog.logWarning("kelondroBLOBHeap", "BLOB " + heapFile.getName() + ": skiped not wellformed key " + new String(key) + " at seek pos " + seek);
                 }
             }            
             // new seek position
             seek += 4L + reclen;
         }
+        indexready.finish();
         
         // try to merge free entries
         if (this.free.size() > 1) {
@@ -157,6 +155,14 @@ public final class kelondroBLOBHeap implements kelondroBLOB {
             serverLog.logInfo("kelondroBLOBHeap", "BLOB " + heapFile.getName() + ": merged " + merged + " free records");
         }
         
+        try {
+            this.index = indexready.result();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        } catch (ExecutionException e) {
+            e.printStackTrace();
+        }
+        
         // DEBUG
         /*
         Iterator<byte[]> i = index.keys(true, null);
diff --git a/source/de/anomic/kelondro/kelondroBytesLongMap.java b/source/de/anomic/kelondro/kelondroBytesLongMap.java
index 6558a5ec0..51969fc90 100644
--- a/source/de/anomic/kelondro/kelondroBytesLongMap.java
+++ b/source/de/anomic/kelondro/kelondroBytesLongMap.java
@@ -27,18 +27,18 @@ package de.anomic.kelondro;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Iterator;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
 
 public class kelondroBytesLongMap {
     
     private final kelondroRow rowdef;
-    private kelondroIndex index;
-    
-    public kelondroBytesLongMap(final kelondroIndex ki) {
-        assert (ki.row().columns() == 2); // must be a key/index relation
-        assert (ki.row().width(1) == 8);  // the value must be a b256-encoded int, 4 bytes long
-        this.index = ki;
-        this.rowdef = ki.row();
-    }
+    private kelondroRAMIndex index;
     
     public kelondroBytesLongMap(final int keylength, final kelondroByteOrder objectOrder, final int space) {
         this.rowdef = new kelondroRow(new kelondroColumn[]{new kelondroColumn("key", kelondroColumn.celltype_binary, kelondroColumn.encoder_bytes, keylength, "key"), new kelondroColumn("long c-8 {b256}")}, objectOrder, 0);
@@ -132,4 +132,73 @@ public class kelondroBytesLongMap {
         index = null;
     }
     
+    public static initDataConsumer asynchronusInitializer(final int keylength, final kelondroByteOrder objectOrder, final int space, int bufferSize) {
+        initDataConsumer initializer = new initDataConsumer(new kelondroBytesLongMap(keylength, objectOrder, space), bufferSize);
+        ExecutorService service = Executors.newSingleThreadExecutor();
+        initializer.setResult(service.submit(initializer));
+        service.shutdown();
+        return initializer;
+    }
+
+    public static class entry {
+        public byte[] key;
+        public long l;
+        public entry(final byte[] key, final long l) {
+            this.key = key;
+            this.l = l;
+        }
+    }
+    
+    public static class initDataConsumer implements Callable<kelondroBytesLongMap> {
+
+        private BlockingQueue<entry> cache;
+        private final entry poison = new entry(new byte[0], 0);
+        private kelondroBytesLongMap map;
+        private Future<kelondroBytesLongMap> result;
+        
+        public initDataConsumer(kelondroBytesLongMap map, int bufferCount) {
+            this.map = map;
+            cache = new ArrayBlockingQueue<entry>(bufferCount);
+        }
+        
+        protected void setResult(Future<kelondroBytesLongMap> result) {
+            this.result = result;
+        }
+        
+        public void consume(final byte[] key, final long l) {
+            try {
+                cache.put(new entry(key, l));
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+        
+        public void finish() {
+            try {
+                cache.put(poison);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+        
+        public kelondroBytesLongMap result() throws InterruptedException, ExecutionException {
+            return this.result.get();
+        }
+        
+        public kelondroBytesLongMap call() throws IOException {
+            try {
+                entry c;
+                while(true) {
+                    c = cache.take();
+                    if (c == poison) break;
+                    map.addl(c.key, c.l);
+                }
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            map.index.finishInitialization();
+            return map;
+        }
+        
+    }
 }
diff --git a/source/de/anomic/kelondro/kelondroRAMIndex.java b/source/de/anomic/kelondro/kelondroRAMIndex.java
index a2116a610..55ed252bf 100644
--- a/source/de/anomic/kelondro/kelondroRAMIndex.java
+++ b/source/de/anomic/kelondro/kelondroRAMIndex.java
@@ -57,7 +57,7 @@ public class kelondroRAMIndex implements kelondroIndex {
         return index0.row();
     }
     
-    private final void finishInitialization() {
+    protected final void finishInitialization() {
     	if (index1 == null) {
             // finish initialization phase
             index0.sort();