Index: org/apache/tomcat/util/threads/ThreadPool.java
===================================================================
--- org/apache/tomcat/util/threads/ThreadPool.java	(revision 831814)
+++ org/apache/tomcat/util/threads/ThreadPool.java	(working copy)
@@ -783,7 +783,7 @@
      * @return The thread status display
      */
     public String threadStatusString() {
-        StringBuffer sb=new StringBuffer();
+        StringBuilder sb=new StringBuilder();
         Iterator it=threads.keySet().iterator();
         sb.append("<ul>");
         while( it.hasNext()) {