This article is about the effect; for the spell, see Haste (spell).
Ief haste

Hasted creatures gain a 50% bonus to their movement rate, a +4 dodge bonus to armor class and an extra attack every round. While hasted, all spellcasting times are cut in half. This effect does not stack with itself, although the individual benefits may stack with similar benefits from sources other than haste. This effect is countered by the slow effect.

There are several ways in which a character can become hasted:

Monk speed stacks with haste.