Use cStringIO where available.
diff --git a/Lib/SimpleHTTPServer.py b/Lib/SimpleHTTPServer.py
index 93662ab..93af109 100644
--- a/Lib/SimpleHTTPServer.py
+++ b/Lib/SimpleHTTPServer.py
@@ -17,7 +17,10 @@
 import cgi
 import shutil
 import mimetypes
-from StringIO import StringIO
+try:
+    from cStringIO import StringIO
+except ImportError:
+    from StringIO import StringIO
 
 
 class SimpleHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):