Mage · Fire · tier 1 · from level 10

Improved Fireball

+25.2 Fireball

5/5 · level 60 · per second of casting · and 1 more

Improved Fireball 12345

Rank 5/5

Reduces the casting time of your Fireball and Frostfire Bolt spells by 0.5 sec.

Fireball +16.7% +25.2 Frostfire Bolt +20.0% +22.7

Averages, counting crits and misses, for a level 60 Mage 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.