diff --git a/org.eclipse.mat.releng/build.xml b/org.eclipse.mat.releng/build.xml
index 3fb6801..e00b3b5 100644
--- a/org.eclipse.mat.releng/build.xml
+++ b/org.eclipse.mat.releng/build.xml
@@ -159,6 +159,27 @@
 				<exclude name="*test*" />
 			</fileset>
 		</unzip>
+		
+		<!-- optimizing site -->
+		<java classname="org.eclipse.equinox.launcher.Main" fork="true" failonerror="true" dir="${buildDirectory}">
+			<jvmarg value="-Xmx256m" />
+			<classpath>
+				<pathelement location="${eclipseLocation}/plugins/org.eclipse.equinox.launcher_${equinoxLauncherPluginVersion}.jar" />
+			</classpath>
+			
+		    <arg value="-application" /> 
+			<arg value="org.eclipse.update.core.siteOptimizer" />
+			
+		    <arg value="-jarProcessor" />
+			        
+			<arg value="-verbose" />
+			<arg value="-processAll" />
+			<arg value="-pack" />
+			<arg value="-outputDir" />
+			<arg value="${siteDirectory}" />
+			
+		    <arg value="${siteDirectory}" /> 
+		</java>
 
 		<!-- generate p2 meta data -->
 		<java classname="org.eclipse.equinox.launcher.Main" fork="true" failonerror="true">
diff --git a/org.eclipse.mat.releng/site/site.xml b/org.eclipse.mat.releng/site/site.xml
index 8d8659b..39d977a 100644
--- a/org.eclipse.mat.releng/site/site.xml
+++ b/org.eclipse.mat.releng/site/site.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<site>
+<site pack200="true">
    <feature url="features/org.eclipse.mat.chart.feature_0.7.0.@qualifier@.jar" id="org.eclipse.mat.chart.feature" version="0.7.0.@qualifier@">
       <category name="Memory Analyzer Incubation"/>
    </feature>