diff -r ef37c144dc35 core.windows/arch.xml
--- a/core.windows/arch.xml	Sun Mar 04 15:49:11 2012 +0100
+++ b/core.windows/arch.xml	Wed Mar 07 11:23:46 2012 +0100
@@ -592,6 +592,12 @@
     soon go away - as soon as apisupport is rewritten to have quasi-preview
     editor.
     </api>
+  <api name="org.netbeans.core.WindowSystem.show" category="friend" group="systemproperty"
+    type="export">
+      One can use <code>-Dorg.netbeans.core.WindowSystem.show=false</code>
+      to run all initialization of window system except showing the main
+      window. Used by installer to pre-generate caches.
+    </api>
   </p>
  </answer>
 
diff -r ef37c144dc35 core.windows/src/org/netbeans/core/windows/view/ui/MainWindow.java
--- a/core.windows/src/org/netbeans/core/windows/view/ui/MainWindow.java	Sun Mar 04 15:49:11 2012 +0100
+++ b/core.windows/src/org/netbeans/core/windows/view/ui/MainWindow.java	Wed Mar 07 11:23:46 2012 +0100
@@ -390,7 +390,10 @@
    }
 
    public void setVisible(boolean visible) {
-       frame.setVisible(visible);
+        if ("false".equals(System.getProperty("org.netbeans.core.WindowSystem.show"))) { // NOI18N
+            return;
+        }
+        frame.setVisible(visible);
    }
 
    public int getExtendedState() {