Cast speed
Cast speed is a modifier that affects the speed of casting spells.
Cast speed can be found throughout the game, on passive skills, equipment, skill gems, monster affixes, map affixes, and so on.
The base cast time is derived from the spell being used, it is the length of time required to cast a spell. Cast speed is a derived stat which is equal to 1 divided by Cast Time. Therefore if the cast speed is increased, the cast time is reduced. For example, if a player is using a skill with a base cast time of 0.8 seconds, and the player has a total of 50% increased Cast Speed, the result will be:
1 / 0.8 = 1.25 casts per second (base)
1.25 * ( 1 + 0.5 ) = 1.88 casts per second (modified)
1 / 1.88 = Modified cast time of 0.53 seconds
Frenzy charges increase cast speed by 4% per charge.
Passive skills
There are passive skills that grant cast speed bonuses.
Cast speed
These passive skills grant increased cast speed.
Cast speed while dual wielding
These passive skills grant increased cast speed while dual wielding.
Cast speed for curses
These passive skills grant increased cast speed for curses.
Cast speed for summoning totems
These passive skills grant increased cast speed for summoning totems.
Totem cast speed
These passive skills grant increased cast speed for totems.
Minion cast speed
These passive skills grant increased cast speed for minions.