Update: Rift 1.5 Hotfix 15

GENERAL

 * Optimized some bandwidth usage that should help a case of players experiencing high bandwidth usage spikes during gameplay.
 * Bonus fix: Target tooltip health bars should stay within the bounds of the tooltip when moused over shortly after logging in!

Source
http://forums.riftgame.com/official-rift-news/patch-notes/277530-rift-1-5-hotfix-15-8-00am-pdt-11-11-11-na-2-00am-gmt-11-11-11-eu.html