A Note About Performance
Open Manage Network Manager is designed to help you manage your network with alacrity. Unfortunately, the devices managed or the networks that communicate with those devices are not always as fast as this software. If discovery takes a long time (it can), often network and device latency is the culprit. You can also optimize installations to be faster (see the recommendations in the Installation Guide and Common Services Guides), and limit device queries with filters, but device and network latency limit how quickly your system can respond.
If you use management systems other than this one, you must perform a device level resync before performing configuration actions. Best practice is to use a single management tool whenever possible.