In regards to your query, please refer to the following information :
Chang the ip (<cm:HostIP >IP</cm:HostIP>) in the realprobe_cfg.xml located in BMC Software\BMC TM ART Real Experience Monitor\probe\conf.
And then restart the service.
It should work fine.
Now when you configure the new Probe, please make sure you enter the correct IP. This is to prevent the old ip to appear again after a synch.
The amount of probe do effect on the time it take the application to load specially if remGetProbeStatus property is set to true - then it query each probe for his status
If there is a great amount of probe and it takes the application a lot of time to load, it recommended setting remGetProbeStatus property to false.
To set remGetProbeStatus:
Modify C:\Program Files\BMC Software\BMC TM ART Central 3.7\wwwroot\REM\conf\rem_config.properties.
The new settings will take effect after restarting the FrontEndServer.
After the application is loaded, there is option to see the Network Probe status.
To enable the display of Network Probe statuses - On the Network Probes tab, click Enable Probe Status.
To disable the display of Network Probe statuses - On the Network Probes tab, click Disable Probe Status.