code: private static void configure()
      {
          String propertyFile = System.getProperty( SYSTEM_PROPERTY, PROPERTYFILENAME );
  
          InputStream in = findConfigFile( propertyFile,
                                           "/com/ecyrd/speed4j/default_speed4j.properties");
  
          configure(in);
      }
docs: Does the default configuration by trying to locate the default
  config file as defined in the System properties.