Github user jburwell commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1470#discussion_r59294640
  
    --- Diff: 
core/src/com/cloud/agent/resource/virtualnetwork/facade/AbstractConfigItemFacade.java
 ---
    @@ -104,13 +109,25 @@ public static AbstractConfigItemFacade 
getInstance(final Class<? extends Network
             return instance;
         }
     
    +
    +    private static String appendUuidToJsonFiles(final String filename) {
    +        String remoteFileName = new String(filename);
    --- End diff --
    
    Use of ``new String()`` is a significant performance problem as it bypasses 
the constant pool -- placing additional pressure on the heap and garbage 
collector.  The ``StringBuilder`` class is provided for these types of 
circumstances and avoids these performance problems.


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