diff --git a/src/main/java/de/neemann/digital/gui/components/table/ExpressionCreator.java b/src/main/java/de/neemann/digital/gui/components/table/ExpressionCreator.java
index 46aaa112b..8f97e876b 100644
--- a/src/main/java/de/neemann/digital/gui/components/table/ExpressionCreator.java
+++ b/src/main/java/de/neemann/digital/gui/components/table/ExpressionCreator.java
@@ -33,6 +33,7 @@ public class ExpressionCreator {
     private static final int COMPLEX_VAR_SIZE = 8;
 
     private final TruthTable theTable;
+    private ProgressListener progressListener;
 
     /**
      * Creates a new instance
@@ -98,6 +99,8 @@ public class ExpressionCreator {
         listener.close();
         time = System.currentTimeMillis() - time;
         LOGGER.debug("time: " + time / 1000.0 + " sec");
+        if (progressListener!=null)
+            progressListener.complete();
     }
 
     private Job simplify(ExpressionListener listener, List<Variable> vars, String resultName, BoolTable boolTable) throws AnalyseException, ExpressionException {
@@ -127,6 +130,26 @@ public class ExpressionCreator {
         }
     }
 
+    public ExpressionCreator setProgressListener(ProgressListener progressListener) {
+        this.progressListener = progressListener;
+        return this;
+    }
+
+    /**
+     * Listener used to monitor the progress
+     */
+    public interface ProgressListener {
+        /**
+         * Called if a equation is calculated
+         */
+        void oneCompleted();
+
+        /**
+         * Called if all equations are calculated
+         */
+        void complete();
+    }
+
     private final class Job {
         private final List<Variable> localVars;
         private final BoolTable boolTable;
@@ -146,6 +169,8 @@ public class ExpressionCreator {
             long time = System.currentTimeMillis();
             getMinimizer(localVars.size()).minimize(localVars, boolTable, resultName, listener);
             LOGGER.info("finished job with complexity " + getComplexity() + ":  " + (System.currentTimeMillis() - time) / 1000 + "sec");
+            if (progressListener!=null)
+                progressListener.oneCompleted();
         }
 
         private int getComplexity() {
diff --git a/src/main/java/de/neemann/digital/gui/components/table/ProgressDialog.java b/src/main/java/de/neemann/digital/gui/components/table/ProgressDialog.java
new file mode 100644
index 000000000..9e970df0a
--- /dev/null
+++ b/src/main/java/de/neemann/digital/gui/components/table/ProgressDialog.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2019 Helmut Neemann.
+ * Use of this source code is governed by the GPL v3 license
+ * that can be found in the LICENSE file.
+ */
+package de.neemann.digital.gui.components.table;
+
+import de.neemann.digital.lang.Lang;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class ProgressDialog extends JDialog implements ExpressionCreator.ProgressListener {
+    private final JProgressBar bar;
+    private int prog;
+
+    /**
+     * Create a new instance
+     *
+     * @param tableDialog the table dialog
+     */
+    public ProgressDialog(TableDialog tableDialog) {
+        super(tableDialog,false);
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+
+        bar = new JProgressBar(0, tableDialog.getModel().getTable().getResultCount());
+        bar.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
+        final JLabel label = new JLabel(Lang.get("msg_optimizationInProgress"));
+        label.setBorder(BorderFactory.createEmptyBorder(5,5,0,5));
+        getContentPane().add(label, BorderLayout.NORTH);
+        getContentPane().add(bar, BorderLayout.SOUTH);
+
+        pack();
+        setLocationRelativeTo(tableDialog);
+        SwingUtilities.invokeLater(() -> setVisible(true));
+    }
+
+    @Override
+    public void oneCompleted() {
+        SwingUtilities.invokeLater(() -> bar.setValue(++prog));
+    }
+
+    @Override
+    public void complete() {
+        SwingUtilities.invokeLater(this::dispose);
+    }
+}
diff --git a/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java b/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
index ae4c28586..83effa8ac 100644
--- a/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
+++ b/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
@@ -599,15 +599,16 @@ public class TableDialog extends JDialog {
                 expressionListener = new ExpressionListenerJK(expressionListener);
 
             final TruthTable table = model.getTable();
-            if (table.getResultCount() > 4 && table.getVars().size() > 8) {
-                if (!allSolutionsDialog.isVisible())
-                    allSolutionsDialog.setVisible(true);
-                allSolutionsDialog.setText(Lang.get("msg_optimizationInProgress"));
+            if (table.getVars().size() >= 8) {
+                ExpressionCreator.ProgressListener progress =
+                        table.getResultCount() == 1 ? null :
+                                new ProgressDialog(this);
+
                 ExpressionListener finalExpressionListener = expressionListener;
                 new Thread(() -> {
                     ExpressionListenerStore storage = new ExpressionListenerStore(null);
                     try {
-                        new ExpressionCreator(table).create(storage);
+                        new ExpressionCreator(table).setProgressListener(progress).create(storage);
                     } catch (ExpressionException | FormatterException | AnalyseException e) {
                         SwingUtilities.invokeLater(() -> {
                             allSolutionsDialog.setVisible(false);