Index: /trunk/src/VBox/Frontends/VBoxHeadless/VBoxHeadless.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VBoxHeadless/VBoxHeadless.cpp	(revision 44157)
+++ /trunk/src/VBox/Frontends/VBoxHeadless/VBoxHeadless.cpp	(revision 44158)
@@ -1287,4 +1287,9 @@
             com::SafeArray<VBoxEventType_T> eventTypes;
             eventTypes.push_back(VBoxEventType_OnGuestPropertyChanged);
+
+            /* Set the notification pattern to not cause too much load.
+             * Remove (or extend) this pattern when more guest properties need to be handled. */
+            CHECK_ERROR(machine, COMSETTER(GuestPropertyNotificationPatterns)(Bstr("/VirtualBox/GuestInfo/OS/*Logged*").raw()));
+
             CHECK_ERROR(es, RegisterListener(vboxListener, ComSafeArrayAsInParam(eventTypes), true));
         }