Fast monsters

For more information on this article, visit the Fast monsters page on the Doom Wiki.

Fast monsters can be obtained in several ways:

With a skill setting containing FastMonsters
With sv_fastmonsters console variable, which can be set with the -fast parameter or the DM flag 32768
By using +ALWAYSFAST in a monster definition

Fast monsters can be prevented by using the +NEVERFAST in a monster definition.

In fast monsters mode, the following effects apply:

Actors with fast states halve the tic duration of these states
Actors use their FastSpeed, if defined, instead of their normal Speed
If nightmarefast is set in GameInfo, states calling A_Chase (or a variant) and having a duration greater than three tics have their duration halved to a minimum of three. This effect can be obtained independently of fast monsters mode by using the relevant flag in the A_Chase call.

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