Hi,
Field like origin,usertag etc take a long time because of robot nis cache. For example, update the user tag of the robot, trigger the callback "nis_cache_clean" in controller.
I know because i have developed a probe that updates the origin and usertag fields automatically (and the customer complained about the same thing...). After a little troubleshooting, the hub developer telled me to clean the nis_cache of the robot. Otherwise the hub dont see the update when he callback the robot (because of this cache).
After few seconds/minutes your field will be updated in the USM.
Best Regards,
Thomas