I noticed it takes about half a second now for aura addons to get in-game conditions. Unless it's only happening on the power bar of a new druid I play.
Every one of these mods relies on the combatlog. Try updating your add-ons or disabling them 1 at a time until things return to normal. For example, skada, dbm, weak auras, need to know, grid, etc, etc.
If you latency to the world server has increased this also could be causing the problem.