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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/performance/java/SynchronizedAccessTest.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/performance/java/SynchronizedAccessTest.java
new file mode 100644
index 000000000..f1ab3e1bd
--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/performance/java/SynchronizedAccessTest.java
@@ -0,0 +1,191 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.tests.performance.java;
+
+import gnu.trove.map.hash.TIntIntHashMap;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+import org.simantics.db.testing.base.TestCommonPerf;
+
+
+public class SynchronizedAccessTest extends TestCommonPerf {
+
+	public void perform3(int threads) throws InterruptedException {
+
+		final Lock lock = new ReentrantLock(false);
+		final TIntIntHashMap map = new TIntIntHashMap();
+		
+		class CounterThread extends Thread {
+
+			final private int index;
+			final private Semaphore start;
+			final private CountDownLatch latch;
+			
+			public CounterThread(int index, Semaphore start, CountDownLatch latch) {
+				this.index = index;
+				this.start = start;
+				this.latch = latch;
+			}
+			
+			@Override
+			public void run() {
+				
+				try {
+					start.acquire();
+				} catch (InterruptedException e) {
+					e.printStackTrace();
+				}
+				
+				for(int i=0;i<1000000;i++) {
+					lock.lock();
+					map.put(i, i);
+					lock.unlock();
+				}
+				
+				latch.countDown();
+				
+			}
+			
+		}
+		
+		CountDownLatch latch = new CountDownLatch(threads);
+		Semaphore starter = new Semaphore(0);
+		
+		for(int i=0;i<threads;i++) new CounterThread(i, starter, latch).start();
+		
+		Thread.sleep(500);
+		
+		starter.release(threads);
+		long start = System.nanoTime();
+		latch.await();
+		long duration = System.nanoTime() - start;
+		System.err.println("took " + 1e-9*duration);
+		
+	}
+
+	public void perform2(int threads) throws InterruptedException {
+
+		final TIntIntHashMap map = new TIntIntHashMap();
+		
+		class CounterThread extends Thread {
+
+			final private int index;
+			final private Semaphore start;
+			final private CountDownLatch latch;
+			
+			public CounterThread(int index, Semaphore start, CountDownLatch latch) {
+				this.index = index;
+				this.start = start;
+				this.latch = latch;
+			}
+			
+			@Override
+			public void run() {
+				
+				try {
+					start.acquire();
+				} catch (InterruptedException e) {
+					e.printStackTrace();
+				}
+				
+				for(int i=0;i<1000000;i++) {
+					synchronized(map) {
+						map.put(i, i);
+					}
+				}
+				
+				latch.countDown();
+				
+			}
+			
+		}
+		
+		CountDownLatch latch = new CountDownLatch(threads);
+		Semaphore starter = new Semaphore(0);
+		
+		for(int i=0;i<threads;i++) new CounterThread(i, starter, latch).start();
+		
+		Thread.sleep(500);
+		
+		starter.release(threads);
+		long start = System.nanoTime();
+		latch.await();
+		long duration = System.nanoTime() - start;
+		System.err.println("took " + 1e-9*duration);
+		
+	}
+
+	public void perform(int threads) throws InterruptedException {
+
+		class CounterThread extends Thread {
+
+			final private int index;
+			final private Semaphore start;
+			final private CountDownLatch latch;
+			
+			public CounterThread(int index, Semaphore start, CountDownLatch latch) {
+				this.index = index;
+				this.start = start;
+				this.latch = latch;
+			}
+			
+			@Override
+			public void run() {
+				
+				try {
+					start.acquire();
+				} catch (InterruptedException e) {
+					e.printStackTrace();
+				}
+
+				final TIntIntHashMap map = new TIntIntHashMap();
+				
+				for(int i=0;i<1000000;i++) {
+					synchronized(map) {
+						map.put(i, i);
+					}
+				}
+				
+				latch.countDown();
+				
+			}
+			
+		}
+		
+		CountDownLatch latch = new CountDownLatch(threads);
+		Semaphore starter = new Semaphore(0);
+		
+		for(int i=0;i<threads;i++) new CounterThread(i, starter, latch).start();
+		
+		Thread.sleep(500);
+		
+		starter.release(threads);
+		long start = System.nanoTime();
+		latch.await();
+		long duration = System.nanoTime() - start;
+		System.err.println("took " + 1e-9*duration);
+		
+	}
+	
+	public void test() throws Exception {
+
+		for(int i=0;i<5;i++) perform(4);
+		for(int i=0;i<5;i++) perform2(4);
+		for(int i=0;i<5;i++) perform3(4);
+		
+	}
+
+}