Shaman · Restoration · tier 1 · from level 10
Improved Healing Wave
+110 Healing Wave
5/5 · level 60 · per second of casting
Improved Healing Wave
Rank 5/5
Reduces the casting time of your Healing Wave spell by 0.5 sec.
Averages, counting crits and misses, for a level 60 Shaman with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.