diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/Checksum.java b/source/net/sourceforge/filebot/ui/panel/sfv/Checksum.java
index 1fda43bc..1b39fcc9 100644
--- a/source/net/sourceforge/filebot/ui/panel/sfv/Checksum.java
+++ b/source/net/sourceforge/filebot/ui/panel/sfv/Checksum.java
@@ -5,7 +5,6 @@ package net.sourceforge.filebot.ui.panel.sfv;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.beans.PropertyChangeSupport;
-import java.io.File;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -26,7 +25,10 @@ public class Checksum {
 	
 	
 	public static enum State {
-		PENDING, INPROGRESS, READY, ERROR;
+		PENDING,
+		INPROGRESS,
+		READY,
+		ERROR;
 	}
 	
 	
@@ -41,11 +43,10 @@ public class Checksum {
 	}
 	
 
-	public Checksum(File file) {
-		computationTask = new ChecksumComputationTask(file);
-		computationTask.addPropertyChangeListener(new ComputationTaskPropertyChangeListener());
+	public Checksum(ChecksumComputationTask computationTask) {
+		this.computationTask = computationTask;
 		
-		ChecksumComputationExecutor.getInstance().execute(computationTask);
+		this.computationTask.addPropertyChangeListener(new ComputationTaskPropertyChangeListener());
 	}
 	
 
diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationExecutor.java b/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationExecutor.java
deleted file mode 100644
index 6fbedf22..00000000
--- a/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationExecutor.java
+++ /dev/null
@@ -1,224 +0,0 @@
-
-package net.sourceforge.filebot.ui.panel.sfv;
-
-
-import java.beans.PropertyChangeListener;
-import java.beans.PropertyChangeSupport;
-import java.util.concurrent.LinkedBlockingQueue;
-
-import javax.swing.SwingUtilities;
-
-import net.sourceforge.tuned.PausableThreadPoolExecutor;
-
-
-public class ChecksumComputationExecutor {
-	
-	public static final String PAUSED_PROPERTY = "PAUSED_PROPERTY";
-	public static final String ACTIVE_PROPERTY = "ACTIVE_PROPERTY";
-	public static final String REMAINING_TASK_COUNT_PROPERTY = "REMAINING_TASK_COUNT_PROPERTY";
-	public static final String ACTIVE_SESSION_TASK_COUNT_PROPERTY = "ACTIVE_SESSION_TASK_COUNT_PROPERTY";
-	
-	private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
-	
-	private static final int MINIMUM_POOL_SIZE = 1;
-	
-	private Boolean active = false;
-	private long lastTaskCount = 0;
-	
-	private static ChecksumComputationExecutor instance = new ChecksumComputationExecutor();
-	
-	private LinkedBlockingQueue<ChecksumComputationTask> workQueue = new LinkedBlockingQueue<ChecksumComputationTask>();
-	
-	private PausableThreadPoolExecutor executor = new PausableThreadPoolExecutor(MINIMUM_POOL_SIZE, workQueue) {
-		
-		@Override
-		protected void beforeExecute(Thread t, Runnable r) {
-			super.beforeExecute(t, r);
-			fireRemainingTaskCountChange();
-		}
-		
-
-		@Override
-		protected void afterExecute(Runnable r, Throwable t) {
-			// afterExecute is called from the same thread, the runnable is called,
-			// so there is at least one active thread
-			if (workQueue.isEmpty() && getActiveCount() <= 1)
-				setActive(false);
-		}
-	};
-	
-	
-	public static ChecksumComputationExecutor getInstance() {
-		return instance;
-	}
-	
-
-	public void execute(ChecksumComputationTask task) {
-		synchronized (workQueue) {
-			setActive(true);
-			
-			adjustPoolSize();
-			
-			executor.execute(task);
-		}
-		
-		fireActiveSessionTaskCountChange();
-	}
-	
-
-	/**
-	 * increase/decrease the core pool size depending on number of queued tasks
-	 */
-	private void adjustPoolSize() {
-		// for only a few files, use only one thread
-		// for lots of files, use multiple threads
-		// e.g 200 files ~ 1 thread, 1000 files ~ 2 threads, 40000 files ~ 4 threads
-		int recommendedPoolSize = (int) Math.log10(Math.max(workQueue.size(), 1) + MINIMUM_POOL_SIZE);
-		
-		if (executor.getCorePoolSize() != recommendedPoolSize)
-			executor.setCorePoolSize(recommendedPoolSize);
-	}
-	
-
-	/**
-	 * Only use in block that is synchronized to {@link ChecksumComputationExecutor#getInstance()} after {@link ChecksumComputationExecutor#pause()} has been called.
-	 */
-	public synchronized void resume() {
-		if (!isPaused())
-			return;
-		
-		executor.resume();
-		
-		// invoke property change events on EDT
-		SwingUtilities.invokeLater(new FirePropertyChangeRunnable(PAUSED_PROPERTY, null, executor.isPaused()));
-	}
-	
-
-	/**
-	 * Synchronize to {@link ChecksumComputationExecutor#getInstance()} before using {@link ChecksumComputationExecutor#pause()}.
-	 * 
-	 * <pre>
-	 * synchronized (ChecksumComputationExecutor.getInstance()) {
-	 * 	ChecksumComputationExecutor.getInstance().pause();
-	 * 	
-	 * 	// some code
-	 * 	
-	 * 	ChecksumComputationExecutor.getInstance().resume();
-	 * }
-	 * </pre>
-	 */
-	public synchronized void pause() {
-		if (isPaused())
-			return;
-		
-		executor.pause();
-		
-		// invoke property change events on EDT
-		SwingUtilities.invokeLater(new FirePropertyChangeRunnable(PAUSED_PROPERTY, null, executor.isPaused()));
-	}
-	
-
-	private void setActive(boolean b) {
-		synchronized (active) {
-			if (this.active == b)
-				return;
-			
-			this.active = b;
-			
-			if (!this.active) {
-				// end of active computing session
-				lastTaskCount = executor.getTaskCount();
-				
-				// reset pool size
-				adjustPoolSize();
-			}
-			
-			// invoke property change events on EDT
-			SwingUtilities.invokeLater(new FirePropertyChangeRunnable(ACTIVE_PROPERTY, null, active));
-		}
-	}
-	
-
-	private void fireRemainingTaskCountChange() {
-		SwingUtilities.invokeLater(new FirePropertyChangeRunnable(REMAINING_TASK_COUNT_PROPERTY, null, getRemainingTaskCount()));
-	}
-	
-
-	private void fireActiveSessionTaskCountChange() {
-		SwingUtilities.invokeLater(new FirePropertyChangeRunnable(ACTIVE_SESSION_TASK_COUNT_PROPERTY, null, getActiveSessionTaskCount()));
-	}
-	
-
-	public boolean isPaused() {
-		return executor.isPaused();
-	}
-	
-
-	public boolean isActive() {
-		return active;
-	}
-	
-
-	/**
-	 * 
-	 * @return Number of remaining tasks
-	 */
-	public int getRemainingTaskCount() {
-		return workQueue.size() + executor.getActiveCount();
-	}
-	
-
-	public int getActiveSessionTaskCount() {
-		return (int) (executor.getTaskCount() - lastTaskCount);
-	}
-	
-
-	public void clear() {
-		synchronized (workQueue) {
-			executor.purge();
-			workQueue.clear();
-			
-			adjustPoolSize();
-			
-			fireRemainingTaskCountChange();
-			fireActiveSessionTaskCountChange();
-			
-			if (executor.getActiveCount() == 0) {
-				setActive(false);
-			}
-		}
-	}
-	
-
-	public void purge() {
-		executor.purge();
-		fireActiveSessionTaskCountChange();
-	}
-	
-
-	public void addPropertyChangeListener(PropertyChangeListener listener) {
-		propertyChangeSupport.addPropertyChangeListener(listener);
-	}
-	
-	
-	private class FirePropertyChangeRunnable implements Runnable {
-		
-		private String property;
-		private Object oldValue;
-		private Object newValue;
-		
-		
-		public FirePropertyChangeRunnable(String property, Object oldValue, Object newValue) {
-			this.property = property;
-			this.oldValue = oldValue;
-			this.newValue = newValue;
-		}
-		
-
-		@Override
-		public void run() {
-			propertyChangeSupport.firePropertyChange(property, oldValue, newValue);
-		}
-	}
-	
-}
diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationService.java b/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationService.java
new file mode 100644
index 00000000..47a6b91d
--- /dev/null
+++ b/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationService.java
@@ -0,0 +1,277 @@
+
+package net.sourceforge.filebot.ui.panel.sfv;
+
+
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyChangeSupport;
+import java.io.File;
+import java.util.ArrayList;
+import java.util.ConcurrentModificationException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import javax.swing.SwingUtilities;
+
+
+public class ChecksumComputationService {
+	
+	public static final String ACTIVE_PROPERTY = "ACTIVE_PROPERTY";
+	public static final String REMAINING_TASK_COUNT_PROPERTY = "REMAINING_TASK_COUNT_PROPERTY";
+	
+	private static final ChecksumComputationService service = new ChecksumComputationService();
+	
+	
+	public static ChecksumComputationService getService() {
+		return service;
+	}
+	
+	private final Map<File, ChecksumComputationExecutor> executors = new HashMap<File, ChecksumComputationExecutor>();
+	
+	private final AtomicInteger activeSessionTaskCount = new AtomicInteger(0);
+	private final AtomicInteger remainingTaskCount = new AtomicInteger(0);
+	
+	private final PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
+	
+	
+	private ChecksumComputationService() {
+		
+	}
+	
+
+	public ChecksumComputationTask submit(File file, File workerQueueKey) {
+		ChecksumComputationTask task = new ChecksumComputationTask(file);
+		
+		getExecutor(workerQueueKey).execute(task);
+		
+		return task;
+	}
+	
+
+	public void cancelAll() {
+		synchronized (executors) {
+			for (ChecksumComputationExecutor executor : executors.values()) {
+				executor.shutdownNow();
+			}
+			
+			setActive(false);
+		}
+	}
+	
+
+	public boolean isActive() {
+		return activeSessionTaskCount.get() > 0;
+	}
+	
+
+	public int getRemainingTaskCount() {
+		return remainingTaskCount.get();
+	}
+	
+
+	public int getActiveSessionTaskCount() {
+		return activeSessionTaskCount.get();
+	}
+	
+
+	public void purge() {
+		synchronized (executors) {
+			for (ChecksumComputationExecutor executor : executors.values()) {
+				executor.purge();
+			}
+		}
+	}
+	
+
+	private ChecksumComputationExecutor getExecutor(File workerQueueKey) {
+		synchronized (executors) {
+			ChecksumComputationExecutor executor = executors.get(workerQueueKey);
+			
+			if (executor == null) {
+				executor = new ChecksumComputationExecutor();
+				executors.put(workerQueueKey, executor);
+			}
+			
+			return executor;
+		}
+	}
+	
+	
+	private class ChecksumComputationExecutor extends ThreadPoolExecutor {
+		
+		private static final int MINIMUM_POOL_SIZE = 1;
+		
+		
+		public ChecksumComputationExecutor() {
+			super(MINIMUM_POOL_SIZE, MINIMUM_POOL_SIZE, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(), new ChecksumComputationThreadFactory());
+		}
+		
+
+		private void adjustPoolSize() {
+			// for only a few files, use one thread
+			// for lots of files, use multiple threads
+			// e.g 50 files ~ 1 thread, 1000 files ~ 3 threads, 40000 files ~ 5 threads
+			
+			int preferredPoolSize = MINIMUM_POOL_SIZE;
+			
+			int queueSize = getQueue().size();
+			
+			if (queueSize > 0) {
+				preferredPoolSize += Math.log10(Math.max(queueSize / 10, 1));
+			}
+			
+			if (getCorePoolSize() != preferredPoolSize) {
+				setCorePoolSize(preferredPoolSize);
+			}
+		}
+		
+
+		@Override
+		public void execute(Runnable command) {
+			if (activeSessionTaskCount.getAndIncrement() <= 0) {
+				setActive(true);
+			}
+			
+			super.execute(command);
+			
+			adjustPoolSize();
+			
+			remainingTaskCount.incrementAndGet();
+			fireRemainingTaskCountChange();
+		}
+		
+
+		@Override
+		public void purge() {
+			try {
+				List<ChecksumComputationTask> cancelledTasks = new ArrayList<ChecksumComputationTask>();
+				
+				for (Runnable entry : getQueue()) {
+					ChecksumComputationTask task = (ChecksumComputationTask) entry;
+					
+					if (task.isCancelled()) {
+						cancelledTasks.add(task);
+					}
+				}
+				
+				for (ChecksumComputationTask task : cancelledTasks) {
+					remove(task);
+				}
+			} catch (ConcurrentModificationException ex) {
+				
+			}
+		}
+		
+
+		@Override
+		public boolean remove(Runnable task) {
+			boolean success = super.remove(task);
+			
+			if (success) {
+				activeSessionTaskCount.decrementAndGet();
+				
+				if (remainingTaskCount.decrementAndGet() <= 0) {
+					setActive(false);
+				}
+				
+				fireRemainingTaskCountChange();
+			}
+			
+			return success;
+		}
+		
+
+		@Override
+		protected void afterExecute(Runnable r, Throwable t) {
+			super.afterExecute(r, t);
+			
+			if (remainingTaskCount.decrementAndGet() <= 0) {
+				setActive(false);
+			}
+			
+			fireRemainingTaskCountChange();
+		}
+	}
+	
+	
+	private void setActive(boolean active) {
+		if (!active) {
+			activeSessionTaskCount.set(0);
+			remainingTaskCount.set(0);
+			
+			synchronized (executors) {
+				executors.clear();
+			}
+		}
+		
+		SwingUtilities.invokeLater(new FirePropertyChangeRunnable(ACTIVE_PROPERTY, active));
+	}
+	
+
+	private void fireRemainingTaskCountChange() {
+		SwingUtilities.invokeLater(new FirePropertyChangeRunnable(REMAINING_TASK_COUNT_PROPERTY, getRemainingTaskCount()));
+	}
+	
+
+	public void addPropertyChangeListener(PropertyChangeListener listener) {
+		propertyChangeSupport.addPropertyChangeListener(listener);
+	}
+	
+
+	public void removePropertyChangeListener(PropertyChangeListener listener) {
+		propertyChangeSupport.removePropertyChangeListener(listener);
+	}
+	
+	
+	private class FirePropertyChangeRunnable implements Runnable {
+		
+		private final String property;
+		private final Object oldValue;
+		private final Object newValue;
+		
+		
+		public FirePropertyChangeRunnable(String property, Object oldValue, Object newValue) {
+			this.property = property;
+			this.oldValue = oldValue;
+			this.newValue = newValue;
+		}
+		
+
+		public FirePropertyChangeRunnable(String property, Object newValue) {
+			this(property, null, newValue);
+		}
+		
+
+		@Override
+		public void run() {
+			propertyChangeSupport.firePropertyChange(property, oldValue, newValue);
+		}
+	}
+	
+
+	private static class ChecksumComputationThreadFactory implements ThreadFactory {
+		
+		private static final AtomicInteger poolNumber = new AtomicInteger(0);
+		
+		private final ThreadGroup group = new ThreadGroup("ChecksumComputationPool");
+		private final AtomicInteger threadNumber = new AtomicInteger(0);
+		
+		private final String namePrefix = String.format("%s-%d-thread-", group.getName(), poolNumber.incrementAndGet());
+		
+		
+		public Thread newThread(Runnable r) {
+			Thread t = new Thread(group, r, namePrefix + threadNumber.incrementAndGet(), 0);
+			
+			t.setDaemon(false);
+			t.setPriority(Thread.MIN_PRIORITY);
+			
+			return t;
+		}
+	}
+	
+}
diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationTask.java b/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationTask.java
index ef60f6a7..f048855f 100644
--- a/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationTask.java
+++ b/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumComputationTask.java
@@ -14,7 +14,7 @@ public class ChecksumComputationTask extends SwingWorker<Long, Object> {
 	
 	private static final int BUFFER_SIZE = 32 * 1024;
 	
-	private File file;
+	private final File file;
 	
 	
 	public ChecksumComputationTask(File file) {
@@ -36,7 +36,7 @@ public class ChecksumComputationTask extends SwingWorker<Long, Object> {
 			int bytesRead = 0;
 			
 			while ((bytesRead = cis.read(buffer)) >= 0) {
-				if (isCancelled())
+				if (isCancelled() || Thread.currentThread().isInterrupted())
 					break;
 				
 				done += bytesRead;
@@ -54,7 +54,6 @@ public class ChecksumComputationTask extends SwingWorker<Long, Object> {
 
 	@Override
 	public String toString() {
-		return getClass().getSimpleName() + " (" + file.getName() + ")";
+		return String.format("%s (%s)", getClass().getSimpleName(), file.getName());
 	}
-	
 }
diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/SfvTableModel.java b/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumTableModel.java
similarity index 94%
rename from source/net/sourceforge/filebot/ui/panel/sfv/SfvTableModel.java
rename to source/net/sourceforge/filebot/ui/panel/sfv/ChecksumTableModel.java
index 174b306c..0a820d76 100644
--- a/source/net/sourceforge/filebot/ui/panel/sfv/SfvTableModel.java
+++ b/source/net/sourceforge/filebot/ui/panel/sfv/ChecksumTableModel.java
@@ -17,13 +17,9 @@ import javax.swing.table.AbstractTableModel;
 import net.sourceforge.filebot.FileFormat;
 
 
-class SfvTableModel extends AbstractTableModel {
+class ChecksumTableModel extends AbstractTableModel {
 	
 	private List<ChecksumRow> rows = new ArrayList<ChecksumRow>();
-	
-	/**
-	 * Used for Name->Checksum mapping (for performance reasons)
-	 */
 	private Map<String, ChecksumRow> rowMap = new HashMap<String, ChecksumRow>();
 	
 	private List<File> checksumColumnRoots = new ArrayList<File>();
@@ -145,7 +141,7 @@ class SfvTableModel extends AbstractTableModel {
 		rows.removeAll(rowsToRemove);
 		fireTableRowsDeleted(rowIndices[0], rowIndices[rowIndices.length - 1]);
 		
-		ChecksumComputationExecutor.getInstance().purge();
+		ChecksumComputationService.getService().purge();
 	}
 	
 
@@ -158,7 +154,7 @@ class SfvTableModel extends AbstractTableModel {
 			}
 		}
 		
-		ChecksumComputationExecutor.getInstance().clear();
+		ChecksumComputationService.getService().cancelAll();
 		
 		checksumColumnRoots.clear();
 		rows.clear();
@@ -174,7 +170,7 @@ class SfvTableModel extends AbstractTableModel {
 	}
 	
 
-	public LinkedHashMap<String, Checksum> getChecksumColumn(File columnRoot) {
+	public Map<String, Checksum> getChecksumColumn(File columnRoot) {
 		LinkedHashMap<String, Checksum> checksumMap = new LinkedHashMap<String, Checksum>();
 		
 		for (ChecksumRow row : rows) {
diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/SfvPanel.java b/source/net/sourceforge/filebot/ui/panel/sfv/SfvPanel.java
index 1bc75631..ef8f01ab 100644
--- a/source/net/sourceforge/filebot/ui/panel/sfv/SfvPanel.java
+++ b/source/net/sourceforge/filebot/ui/panel/sfv/SfvPanel.java
@@ -94,7 +94,7 @@ public class SfvPanel extends FileBotPanel {
 
 		@Override
 		public void actionPerformed(ActionEvent e) {
-			SfvTableModel model = (SfvTableModel) sfvTable.getModel();
+			ChecksumTableModel model = (ChecksumTableModel) sfvTable.getModel();
 			
 			ArrayList<File> options = new ArrayList<File>();
 			
diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/SfvTable.java b/source/net/sourceforge/filebot/ui/panel/sfv/SfvTable.java
index 4b536f40..5aaaaa4a 100644
--- a/source/net/sourceforge/filebot/ui/panel/sfv/SfvTable.java
+++ b/source/net/sourceforge/filebot/ui/panel/sfv/SfvTable.java
@@ -39,7 +39,7 @@ class SfvTable extends JTable implements TransferablePolicySupport, Saveable {
 	
 	
 	public SfvTable() {
-		final SfvTableModel model = (SfvTableModel) getModel();
+		final ChecksumTableModel model = (ChecksumTableModel) getModel();
 		model.addPropertyChangeListener(repaintListener);
 		
 		setFillsViewportHeight(true);
@@ -69,7 +69,7 @@ class SfvTable extends JTable implements TransferablePolicySupport, Saveable {
 
 	@Override
 	protected TableModel createDefaultDataModel() {
-		return new SfvTableModel();
+		return new ChecksumTableModel();
 	}
 	
 
@@ -93,7 +93,7 @@ class SfvTable extends JTable implements TransferablePolicySupport, Saveable {
 	public void clear() {
 		((BackgroundFileTransferablePolicy<?>) getTransferablePolicy()).cancelAll();
 		
-		((SfvTableModel) getModel()).clear();
+		((ChecksumTableModel) getModel()).clear();
 	}
 	
 	private PropertyChangeListener repaintListener = new PropertyChangeListener() {
@@ -115,7 +115,7 @@ class SfvTable extends JTable implements TransferablePolicySupport, Saveable {
 	
 
 	public String getDefaultFileName() {
-		SfvTableModel model = (SfvTableModel) getModel();
+		ChecksumTableModel model = (ChecksumTableModel) getModel();
 		File columnRoot = model.getChecksumColumnRoot(0);
 		
 		String name = "";
@@ -136,7 +136,7 @@ class SfvTable extends JTable implements TransferablePolicySupport, Saveable {
 	
 
 	public void removeRows(int... rowIndices) {
-		SfvTableModel model = (SfvTableModel) getModel();
+		ChecksumTableModel model = (ChecksumTableModel) getModel();
 		model.removeRows(rowIndices);
 	}
 	
@@ -145,7 +145,7 @@ class SfvTable extends JTable implements TransferablePolicySupport, Saveable {
 		try {
 			PrintStream out = new PrintStream(file);
 			
-			SfvTableModel model = (SfvTableModel) getModel();
+			ChecksumTableModel model = (ChecksumTableModel) getModel();
 			File columnRoot = model.getChecksumColumnRoot(checksumColumnIndex);
 			
 			if (columnRoot != null) {
diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/SfvTransferablePolicy.java b/source/net/sourceforge/filebot/ui/panel/sfv/SfvTransferablePolicy.java
index f4eb5e50..141810e8 100644
--- a/source/net/sourceforge/filebot/ui/panel/sfv/SfvTransferablePolicy.java
+++ b/source/net/sourceforge/filebot/ui/panel/sfv/SfvTransferablePolicy.java
@@ -17,12 +17,12 @@ import net.sourceforge.filebot.FileBotUtil;
 import net.sourceforge.filebot.ui.transferablepolicies.BackgroundFileTransferablePolicy;
 
 
-class SfvTransferablePolicy extends BackgroundFileTransferablePolicy<SfvTableModel.Entry> {
+class SfvTransferablePolicy extends BackgroundFileTransferablePolicy<ChecksumTableModel.Entry> {
 	
-	private SfvTableModel tableModel;
+	private ChecksumTableModel tableModel;
 	
 	
-	public SfvTransferablePolicy(SfvTableModel tableModel) {
+	public SfvTransferablePolicy(ChecksumTableModel tableModel) {
 		this.tableModel = tableModel;
 	}
 	
@@ -41,7 +41,7 @@ class SfvTransferablePolicy extends BackgroundFileTransferablePolicy<SfvTableMod
 	
 
 	@Override
-	protected void process(List<SfvTableModel.Entry> chunks) {
+	protected void process(List<ChecksumTableModel.Entry> chunks) {
 		tableModel.addAll(chunks);
 	}
 	
@@ -65,13 +65,13 @@ class SfvTransferablePolicy extends BackgroundFileTransferablePolicy<SfvTableMod
 				String filename = matcher.group(1);
 				String checksumString = matcher.group(2);
 				
-				publish(new SfvTableModel.Entry(filename, new Checksum(checksumString), sfvFile));
+				publish(new ChecksumTableModel.Entry(filename, new Checksum(checksumString), sfvFile));
 				
 				File compareColumnRoot = sfvFile.getParentFile();
 				File compareFile = new File(compareColumnRoot, filename);
 				
 				if (compareFile.exists()) {
-					publish(new SfvTableModel.Entry(filename, new Checksum(compareFile), compareColumnRoot));
+					publish(new ChecksumTableModel.Entry(filename, new Checksum(ChecksumComputationService.getService().submit(compareFile, compareColumnRoot)), compareColumnRoot));
 				}
 			}
 			
@@ -91,29 +91,23 @@ class SfvTransferablePolicy extends BackgroundFileTransferablePolicy<SfvTableMod
 
 	@Override
 	protected void load(List<File> files) {
-		synchronized (ChecksumComputationExecutor.getInstance()) {
-			ChecksumComputationExecutor.getInstance().pause();
-			
-			if (FileBotUtil.containsOnlySfvFiles(files)) {
-				// one or more sfv files
-				for (File file : files) {
-					loadSfvFile(file);
-				}
-			} else if ((files.size() == 1) && files.get(0).isDirectory()) {
-				// one single folder
-				File file = files.get(0);
-				
-				for (File f : file.listFiles()) {
-					load(f, file, "");
-				}
-			} else {
-				// bunch of files
-				for (File f : files) {
-					load(f, f.getParentFile(), "");
-				}
+		if (FileBotUtil.containsOnlySfvFiles(files)) {
+			// one or more sfv files
+			for (File file : files) {
+				loadSfvFile(file);
 			}
+		} else if ((files.size() == 1) && files.get(0).isDirectory()) {
+			// one single folder
+			File file = files.get(0);
 			
-			ChecksumComputationExecutor.getInstance().resume();
+			for (File f : file.listFiles()) {
+				load(f, file, "");
+			}
+		} else {
+			// bunch of files
+			for (File f : files) {
+				load(f, f.getParentFile(), "");
+			}
 		}
 	}
 	
@@ -129,7 +123,7 @@ class SfvTransferablePolicy extends BackgroundFileTransferablePolicy<SfvTableMod
 				load(f, columnRoot, newPrefix);
 			}
 		} else if (file.isFile()) {
-			publish(new SfvTableModel.Entry(prefix + file.getName(), new Checksum(file), columnRoot));
+			publish(new ChecksumTableModel.Entry(prefix + file.getName(), new Checksum(ChecksumComputationService.getService().submit(file, columnRoot)), columnRoot));
 		}
 	}
 	
diff --git a/source/net/sourceforge/filebot/ui/panel/sfv/TotalProgressPanel.java b/source/net/sourceforge/filebot/ui/panel/sfv/TotalProgressPanel.java
index b06eebd2..058bd871 100644
--- a/source/net/sourceforge/filebot/ui/panel/sfv/TotalProgressPanel.java
+++ b/source/net/sourceforge/filebot/ui/panel/sfv/TotalProgressPanel.java
@@ -36,59 +36,44 @@ class TotalProgressPanel extends Box {
 		setBorder(BorderFactory.createCompoundBorder(margin, title));
 		
 		add(progressBar);
-		ChecksumComputationExecutor.getInstance().addPropertyChangeListener(executorListener);
+		ChecksumComputationService.getService().addPropertyChangeListener(executorListener);
 	}
 	
 	private PropertyChangeListener executorListener = new PropertyChangeListener() {
 		
 		public void propertyChange(PropertyChangeEvent evt) {
-			ChecksumComputationExecutor executor = ChecksumComputationExecutor.getInstance();
+			
 			String property = evt.getPropertyName();
 			
-			if (property == ChecksumComputationExecutor.ACTIVE_PROPERTY) {
+			if (property == ChecksumComputationService.ACTIVE_PROPERTY) {
 				Boolean active = (Boolean) evt.getNewValue();
-				setVisible(active);
-				return;
-			}
-			
-			if (property == ChecksumComputationExecutor.PAUSED_PROPERTY) {
-				Boolean paused = (Boolean) evt.getNewValue();
 				
-				if (paused) {
-					progressBar.setString("Updating ...");
+				if (active) {
+					new SetVisibleTimer().start();
 				}
+			} else if (property == ChecksumComputationService.REMAINING_TASK_COUNT_PROPERTY) {
+				
+				int taskCount = ChecksumComputationService.getService().getActiveSessionTaskCount();
+				int progress = taskCount - ChecksumComputationService.getService().getRemainingTaskCount();
 				
-				return;
-			}
-			
-			if (property == ChecksumComputationExecutor.ACTIVE_SESSION_TASK_COUNT_PROPERTY) {
-				progressBar.setMaximum(executor.getActiveSessionTaskCount());
-			}
-			
-			if (property == ChecksumComputationExecutor.REMAINING_TASK_COUNT_PROPERTY) {
-				int progress = executor.getActiveSessionTaskCount() - executor.getRemainingTaskCount();
 				progressBar.setValue(progress);
+				progressBar.setMaximum(taskCount);
+				
+				progressBar.setString(progressBar.getValue() + " / " + progressBar.getMaximum());
 			}
 			
-			progressBar.setString(progressBar.getValue() + " / " + progressBar.getMaximum());
+			if (!ChecksumComputationService.getService().isActive()) {
+				setVisible(false);
+			}
 		}
 	};
 	
 	
-	@Override
-	public void setVisible(boolean flag) {
-		if (flag) {
-			new SetVisibleTimer().start();
-		} else {
-			super.setVisible(false);
-		}
-	}
-	
-	private int millisToSetVisible = 200;
-	
-	
 	private class SetVisibleTimer extends Timer implements ActionListener {
 		
+		private static final int millisToSetVisible = 200;
+		
+		
 		public SetVisibleTimer() {
 			super(millisToSetVisible, null);
 			addActionListener(this);
@@ -97,8 +82,7 @@ class TotalProgressPanel extends Box {
 		
 
 		public void actionPerformed(ActionEvent e) {
-			if (ChecksumComputationExecutor.getInstance().isActive())
-				TotalProgressPanel.super.setVisible(true);
+			setVisible(ChecksumComputationService.getService().isActive());
 		}
 	}
 	
diff --git a/source/net/sourceforge/filebot/ui/transfer/DefaultTransferHandler.java b/source/net/sourceforge/filebot/ui/transfer/DefaultTransferHandler.java
index 4c7682ad..947fc75c 100644
--- a/source/net/sourceforge/filebot/ui/transfer/DefaultTransferHandler.java
+++ b/source/net/sourceforge/filebot/ui/transfer/DefaultTransferHandler.java
@@ -5,12 +5,9 @@ package net.sourceforge.filebot.ui.transfer;
 import java.awt.datatransfer.Clipboard;
 import java.awt.datatransfer.Transferable;
 
-import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.TransferHandler;
 
-import net.sourceforge.filebot.resources.ResourceManager;
-
 
 public class DefaultTransferHandler extends TransferHandler {
 	
diff --git a/source/net/sourceforge/filebot/ui/transferablepolicies/BackgroundFileTransferablePolicy.java b/source/net/sourceforge/filebot/ui/transferablepolicies/BackgroundFileTransferablePolicy.java
index c536ba49..cdaca0ef 100644
--- a/source/net/sourceforge/filebot/ui/transferablepolicies/BackgroundFileTransferablePolicy.java
+++ b/source/net/sourceforge/filebot/ui/transferablepolicies/BackgroundFileTransferablePolicy.java
@@ -150,7 +150,7 @@ public abstract class BackgroundFileTransferablePolicy<V> extends FileTransferab
 					
 					@Override
 					public void run() {
-						firePropertyChange(LOADING_PROPERTY, false, true);
+						propertyChangeSupport.firePropertyChange(LOADING_PROPERTY, false, true);
 					}
 				});
 			}
@@ -168,7 +168,7 @@ public abstract class BackgroundFileTransferablePolicy<V> extends FileTransferab
 					
 					@Override
 					public void run() {
-						firePropertyChange(LOADING_PROPERTY, true, false);
+						propertyChangeSupport.firePropertyChange(LOADING_PROPERTY, true, false);
 					}
 				});
 			}
@@ -184,17 +184,8 @@ public abstract class BackgroundFileTransferablePolicy<V> extends FileTransferab
 	}
 	
 
-	public void removePropertyChangeListener(PropertyChangeListener listener) {
-		propertyChangeSupport.removePropertyChangeListener(listener);
-	}
-	
-
 	public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
 		propertyChangeSupport.removePropertyChangeListener(propertyName, listener);
 	}
 	
-
-	protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
-		propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue);
-	}
 }
diff --git a/source/net/sourceforge/filebot/web/SubsceneSubtitleDescriptor.java b/source/net/sourceforge/filebot/web/SubsceneSubtitleDescriptor.java
index 1713ebef..b54c9c30 100644
--- a/source/net/sourceforge/filebot/web/SubsceneSubtitleDescriptor.java
+++ b/source/net/sourceforge/filebot/web/SubsceneSubtitleDescriptor.java
@@ -5,6 +5,8 @@ package net.sourceforge.filebot.web;
 import java.net.URL;
 import java.util.Map;
 
+import net.sourceforge.tuned.DownloadTask;
+
 
 public class SubsceneSubtitleDescriptor {
 	
diff --git a/source/net/sourceforge/filebot/web/DownloadTask.java b/source/net/sourceforge/tuned/DownloadTask.java
similarity index 97%
rename from source/net/sourceforge/filebot/web/DownloadTask.java
rename to source/net/sourceforge/tuned/DownloadTask.java
index 700f3223..7e7eda18 100644
--- a/source/net/sourceforge/filebot/web/DownloadTask.java
+++ b/source/net/sourceforge/tuned/DownloadTask.java
@@ -1,5 +1,5 @@
 
-package net.sourceforge.filebot.web;
+package net.sourceforge.tuned;
 
 
 import java.io.ByteArrayOutputStream;
@@ -55,8 +55,7 @@ public class DownloadTask extends SwingWorker<ByteBuffer, Object> {
 	
 
 	public DownloadTask(URL url, Map<String, String> postdata) {
-		this.url = url;
-		this.postdata = encodeParameters(postdata);
+		this(url, encodeParameters(postdata));
 	}