Lightning Mastery

From wow.incgamers.com

Talent: Lightning Mastery
Effect: Reduces the cast time of your Lightning Bolt and Chain Lightning spells.
Statistics: Rank 1 = -0.2 sec, Rank 2 = -0.4 sec, Rank 3 = -0.6 sec, Rank 4 = -0.8 sec, Rank 5 = -1 sec.