Gzip using the fastest option.

bin/cbuildbot.py

 #!/usr/bin/python
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """CBuildbot is wrapper around the build process used by the pre-flight queue"""
 
 import errno
 import heapq
@@ skipping 408 matching lines @@
   results_path = os.path.join(buildroot, 'chroot', test_results_dir)
   RunCommand(['sudo', 'chmod', '-R', '+r', results_path])
   try:
     shutil.copytree(results_path, archive_target)
   except:
     Warning('Some files could not be copied')
 
   image_name = 'chromiumos_qemu_image.bin'
   image_path = os.path.join(buildroot, 'src', 'build', 'images', board,
                             'latest', image_name)
-  RunCommand(['gzip', '-f', image_path])
+  RunCommand(['gzip', '-f', '--fast', image_path])
   shutil.copyfile(image_path + '.gz', os.path.join(archive_target,
                                                    image_name + '.gz'))
 
 
 
 def _GetConfig(config_name):
   """Gets the configuration for the build"""
   default = config['default']
   buildconfig = {}
   if not config.has_key(config_name):
@@ skipping 103 matching lines @@
   except:
     # Send failure to master bot.
     if not buildconfig['master'] and buildconfig['important']:
       cbuildbot_comm.PublishStatus(cbuildbot_comm.STATUS_BUILD_FAILED)
 
     raise
 
 
 if __name__ == '__main__':
     main()