diff --git a/openerp/http.py b/openerp/http.py
index 5876cdc6a9a..8c73b33c8a0 100644
--- a/openerp/http.py
+++ b/openerp/http.py
@@ -36,6 +36,7 @@ import werkzeug.wsgi
 
 import openerp
 from openerp.service import security, model as service_model
+from openerp.tools.func import lazy_property
 
 _logger = logging.getLogger(__name__)
 
@@ -1077,22 +1078,28 @@ class Root(object):
         path = openerp.tools.config.session_dir
         _logger.debug('HTTP sessions stored in: %s', path)
         self.session_store = werkzeug.contrib.sessions.FilesystemSessionStore(path, session_class=OpenERPSession)
+        self._loaded = False
 
-        # TODO should we move this to ir.http so that only configured modules are served ?
-        _logger.info("HTTP Configuring static files")
-        self.load_addons()
-
+    @lazy_property
+    def nodb_routing_map(self):
         _logger.info("Generating nondb routing")
-        self.nodb_routing_map = routing_map([''] + openerp.conf.server_wide_modules, True)
+        return routing_map([''] + openerp.conf.server_wide_modules, True)
 
     def __call__(self, environ, start_response):
         """ Handle a WSGI request
         """
+        if not self._loaded:
+            self.load_addons()
+            self._loaded = True
         return self.dispatch(environ, start_response)
 
     def load_addons(self):
         """ Load all addons from addons patch containg static files and
         controllers and configure them.  """
+        # TODO should we move this to ir.http so that only configured modules are served ?
+        _logger.info("HTTP Configuring static files")
+
+        self.__dict__.pop('dispatch', None)
         statics = {}
 
         for addons_path in openerp.modules.module.ad_paths:
@@ -1284,11 +1291,8 @@ class CommonController(Controller):
         """ Method used by client APIs to contact OpenERP. """
         return dispatch_rpc(service, method, args)
 
-root = None
-
-def wsgi_postload():
-    global root
-    root = Root()
-    openerp.service.wsgi_server.register_wsgi_handler(root)
+# register main wsgi handler
+root = Root()
+openerp.service.wsgi_server.register_wsgi_handler(root)
 
 # vim:et:ts=4:sw=4:
diff --git a/openerp/tools/func.py b/openerp/tools/func.py
index ca8bba6bd49..89cdf9fb622 100644
--- a/openerp/tools/func.py
+++ b/openerp/tools/func.py
@@ -3,7 +3,7 @@
 #
 #    OpenERP, Open Source Management Solution
 #    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>).
-#    Copyright (C) 2010 OpenERP s.a. (<http://openerp.com>).
+#    Copyright (C) 2010, 2014 OpenERP s.a. (<http://openerp.com>).
 #
 #    This program is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU Affero General Public License as
@@ -20,11 +20,39 @@
 #
 ##############################################################################
 
-__all__ = ['synchronized']
+__all__ = ['synchronized', 'lazy_property']
 
 from functools import wraps
 from inspect import getsourcefile
 
+
+class lazy_property(object):
+    """ Decorator for a lazy property of an object, i.e., an object attribute
+        that is determined by the result of a method call evaluated once. To
+        reevaluate the property, simply delete the attribute on the object, and
+        get it again.
+    """
+    def __init__(self, fget):
+        self.fget = fget
+        self.name = fget.__name__
+
+    def __get__(self, obj, cls):
+        if obj is None:
+            return self
+        value = self.fget(obj)
+        setattr(obj, self.name, value)
+        return value
+
+    @staticmethod
+    def reset_all(obj):
+        """ Reset all lazy properties on the instance `obj`. """
+        cls = type(obj)
+        obj_dict = obj.__dict__
+        for name in obj_dict.keys():
+            if isinstance(getattr(cls, name, None), lazy_property):
+                obj_dict.pop(name)
+
+
 def synchronized(lock_attr='_lock'):
     def decorator(func):
         @wraps(func)