diff --git a/org.eclipse.pde.doc.user/META-INF/MANIFEST.MF b/org.eclipse.pde.doc.user/META-INF/MANIFEST.MF
index 9d3e13632de..f10e6c89d8a 100644
--- a/org.eclipse.pde.doc.user/META-INF/MANIFEST.MF
+++ b/org.eclipse.pde.doc.user/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.pde.doc.user; singleton:=true
-Bundle-Version: 3.15.100.qualifier
+Bundle-Version: 3.15.200.qualifier
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
 Require-Bundle: org.eclipse.help;bundle-version="[3.2.0,4.0.0)"
diff --git a/org.eclipse.pde.doc.user/pom.xml b/org.eclipse.pde.doc.user/pom.xml
index fe4faf0ef18..4246ed839fd 100644
--- a/org.eclipse.pde.doc.user/pom.xml
+++ b/org.eclipse.pde.doc.user/pom.xml
@@ -17,7 +17,7 @@
     <version>4.32.0-SNAPSHOT</version>
   </parent>
   <artifactId>org.eclipse.pde.doc.user</artifactId>
-  <version>3.15.100-SNAPSHOT</version>
+  <version>3.15.200-SNAPSHOT</version>
   <packaging>eclipse-plugin</packaging>
   
   <properties>
diff --git a/ui/org.eclipse.pde.ui/src/org/eclipse/pde/ui/launcher/PluginsTab.java b/ui/org.eclipse.pde.ui/src/org/eclipse/pde/ui/launcher/PluginsTab.java
index ec5192f5643..6c4c19f4cb4 100644
--- a/ui/org.eclipse.pde.ui/src/org/eclipse/pde/ui/launcher/PluginsTab.java
+++ b/ui/org.eclipse.pde.ui/src/org/eclipse/pde/ui/launcher/PluginsTab.java
@@ -59,6 +59,7 @@ public class PluginsTab extends AbstractLauncherTab {
 	private Combo fDefaultAutoStart;
 	private Spinner fDefaultStartLevel;
 	private final Listener fListener;
+	private boolean fActivated;
 
 	private static final int DEFAULT_SELECTION = 0;
 	private static final int PLUGIN_SELECTION = 1;
@@ -156,6 +157,16 @@ public void createControl(Composite parent) {
 
 	@Override
 	public void initializeFrom(ILaunchConfiguration configuration) {
+		// Long-running initialization happens on first activation of this tab
+	}
+
+	@Override
+	public void activated(ILaunchConfigurationWorkingCopy configuration) {
+		if (fActivated) {
+			// Since this method can be expensive, only activate this tab once.
+			return;
+		}
+
 		try {
 			int index = DEFAULT_SELECTION;
 			if (configuration.getAttribute(IPDELauncherConstants.USE_CUSTOM_FEATURES, false)) {
@@ -174,6 +185,8 @@ public void initializeFrom(ILaunchConfiguration configuration) {
 		} catch (CoreException e) {
 			PDEPlugin.log(e);
 		}
+
+		fActivated = true;
 	}
 
 	@Override
@@ -217,16 +230,9 @@ public Image getImage() {
 		return fImage;
 	}
 
-	/**
-	 * Validates the tab.  If the feature option is chosen, and the workspace is not correctly set up,
-	 * the error message is set.
-	 *
-	 * @see org.eclipse.pde.ui.launcher.AbstractLauncherTab#validateTab()
-	 */
 	@Override
 	public void validateTab() {
-		String errorMessage = null;
-		setErrorMessage(errorMessage);
+		setErrorMessage(null);
 	}
 
 	@Override