diff -r 3ce0102e4c1f Lib/copyreg.py
--- a/Lib/copyreg.py	Wed Oct 09 14:53:01 2013 +0200
+++ b/Lib/copyreg.py	Wed Oct 09 16:16:33 2013 +0200
@@ -182,6 +182,19 @@
 def clear_extension_cache():
     _extension_cache.clear()
 
+# The callbacks are registered here instead of the os module in order to
+# remove the dependency on copyreg and to speed up the interpreter's startup
+# time.
+
+import os
+
+if hasattr(os, "stat_result"):
+    pickle(os.stat_result, os._pickle_stat_result, os._make_stat_result)
+
+if hasattr(os, "statvfs_result"):
+    pickle(os.statvfs_result, os._pickle_statvfs_result,
+           os._make_statvfs_result)
+
 # Standard extension code assignments
 
 # Reserved ranges
diff -r 3ce0102e4c1f Lib/os.py
--- a/Lib/os.py	Wed Oct 09 14:53:01 2013 +0200
+++ b/Lib/os.py	Wed Oct 09 16:16:33 2013 +0200
@@ -945,8 +945,7 @@
     __all__.extend(["spawnlp", "spawnlpe"])
 
 
-import copyreg as _copyreg
-
+# used by copyreg
 def _make_stat_result(tup, dict):
     return stat_result(tup, dict)
 
@@ -954,11 +953,6 @@
     (type, args) = sr.__reduce__()
     return (_make_stat_result, args)
 
-try:
-    _copyreg.pickle(stat_result, _pickle_stat_result, _make_stat_result)
-except NameError: # stat_result may not exist
-    pass
-
 def _make_statvfs_result(tup, dict):
     return statvfs_result(tup, dict)
 
@@ -966,11 +960,6 @@
     (type, args) = sr.__reduce__()
     return (_make_statvfs_result, args)
 
-try:
-    _copyreg.pickle(statvfs_result, _pickle_statvfs_result,
-                     _make_statvfs_result)
-except NameError: # statvfs_result may not exist
-    pass
 
 # Supply os.popen()
 def popen(cmd, mode="r", buffering=-1):