Index: zenmap/zenmapCore/NmapParser.py
===================================================================
--- zenmap/zenmapCore/NmapParser.py	(revision 32983)
+++ zenmap/zenmapCore/NmapParser.py	(working copy)
@@ -125,9 +125,15 @@
 import os.path
 import time
 import socket
-import StringIO
 import copy
 
+# Use the faster cStringIO if available, fallback on StringIO if not
+try:
+    import cStringIO
+    StringIO = cStringIO
+except ImportError:
+    import StringIO
+
 # Prevent loading PyXML
 import xml
 xml.__path__ = [x for x in xml.__path__ if "_xmlplus" not in x]
@@ -503,7 +509,8 @@
     def set_nmap_output(self, nmap_output):
         self._nmap_output.close()
         del self._nmap_output
-        self._nmap_output = StringIO.StringIO(nmap_output)
+        self._nmap_output = StringIO.StringIO()
+        self._nmap_output.write(nmap_output)
 
     def del_nmap_output(self):
         self._nmap_output.close()