There is a nasty little bug in the Notifier compatibility VIs that causes a sever performance hit, and memory leak. This is caused by the caching of the notifier names and not ever flushing stale notifier references when they are destroyed. This bug exists in LV 6.1, 7.0, and 7.1.
More info, including screenshots and bugfix download, located here:
http://forums.lavausergroup.org/index.php?showtopic=1093
Regards,