Index: /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/AbstractMapRendererPerformanceTestParent.java
===================================================================
--- /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/AbstractMapRendererPerformanceTestParent.java	(revision 10906)
+++ /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/AbstractMapRendererPerformanceTestParent.java	(revision 10907)
@@ -72,4 +72,13 @@
     }
 
+    protected static void clean() throws Exception {
+        g = null;
+        img = null;
+        nc = null;
+        dsRestriction = null;
+        dsMultipolygon = null;
+        dsCity = null;
+    }
+
     protected abstract Rendering buildRenderer();
 
Index: /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/StyledMapRendererPerformanceTest.java
===================================================================
--- /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/StyledMapRendererPerformanceTest.java	(revision 10906)
+++ /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/StyledMapRendererPerformanceTest.java	(revision 10907)
@@ -7,4 +7,5 @@
 import javax.imageio.ImageIO;
 
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.openstreetmap.josm.gui.mappaint.MapPaintStyles;
@@ -24,4 +25,9 @@
     }
 
+    @AfterClass
+    public static void clean() throws Exception {
+        AbstractMapRendererPerformanceTestParent.clean();
+    }
+
     @Override
     protected Rendering buildRenderer() {
Index: /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/WireframeMapRendererPerformanceTest.java
===================================================================
--- /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/WireframeMapRendererPerformanceTest.java	(revision 10906)
+++ /trunk/test/performance/org/openstreetmap/josm/data/osm/visitor/paint/WireframeMapRendererPerformanceTest.java	(revision 10907)
@@ -2,4 +2,5 @@
 package org.openstreetmap.josm.data.osm.visitor.paint;
 
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 
@@ -14,4 +15,9 @@
     }
 
+    @AfterClass
+    public static void clean() throws Exception {
+        AbstractMapRendererPerformanceTestParent.clean();
+    }
+
     @Override
     protected Rendering buildRenderer() {