Warn about the slowness of the load invalidations barrier.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2349 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/app.py

@@ -558,6 +558,7 @@ class Application(object):
             # Those invalidations are checked at ZODB level, so it decides if
             # loaded data can be handed to current transaction or if a separate
             # loadBefore call is required.
+            # XXX: A better implementation is required to improve performances
             self.invalidationBarrier()
             return result
         finally: