Magic Casting Time
Basic Idea
This stat reduces the cast speed of all of your spells except for your CC (crowd control spells like Curse of Roots, Sleep, and Sleep Storm).
If you see Casting Time Boost+20 on an item, that is a 20% reduction in the cast speed of your spells. Casting Boost+50 would be a 50% reduction. So on, and so forth. This reduction stacks multiplicatively with other bonuses (i.e. from Stigmas or Chanter buffs).
Cast Time bonuses come from the following sources:
Gear: Currently (as of patch 1.5.0.5), only books and orbs (usually higher level ones) have casting time boost as a stat. The highest is +20 (top-end) and the lowest (from low level blues) is +11. These are all more than +30 lvl requirement items.
Stigmas: There are currently two Stigmas that offer cast time reduction. Vaizel’s Wisdom gives -25% cast time for 15 seconds, with a cooldown of 30 seconds. Boon of Quickness (Asmodian only) gives -50% cast time for 15 seconds, with a cooldown of 5 minutes. These two abilities cannot be used simultaneously.
Buffs: Currently only one buff gives cast time reduction. Word of Quickness (from Chanters) gives -50% cast time for 30 seconds, with a cooldown of 10 minutes.
Thus, the maximum cast speed reduction one can achieve currently is -80% as an Asmodian (Boon of Quickness, Word of Quickness, and +20 Casting Time Boost from your weapon), and -70% as an Elyos (Vaizel’s Wisdom, Word of Quickness, +20 Casting Time Boost from your weapon).
Stacking
Casting Time Boost bonuses stack in a multiplicative manner, not additively. What this means is that if you had 50% cast time reduction from one source, and 50% from another source, it would not result in -100% cast speed (i.e. making your spells instant cast).
It would instead operate in this manner (let’s take a 2 second cast spell as a an example):
2 * 0.5 * 0.5 = 0.5 second cast
The 2 second cast would be reduced to a 0.5 second cast, which is an overall cast speed reduction of 75%. This give the second buff half the value of the first (if they are the same buff level).
Another example: Let’s say you have a buff giving -25% cast time, a book that gives you Casting Time Boost+20, and the Chanter buff that gives -50% cast time.
So you have three separate cast time reductions: 25%, 20%, and 50%.
Let’s say you’re trying to cast Inferno (normally a 4 second cast):
4 * 0.75 * 0.80 * 0.5 = 1.2 second cast.
Thus your total cast time reduction is -70% off the original cast time.
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