FastMonsters in non-Doom games

[Kzer-Za]

It seems that description of this parameter given under ALWAYSFAST flag (the only place where the effect of FastMonsters is described in detail) is accurate only for Doom? Regarding Doom it seems to fit what I observe: if FastMonsters is on (due to difficulty or to turning the gameplay option on) only Demons (and Spectres, of course) have their chase animation duration halved, since only they have the FAST keyword in these states. Of course all monsters seem to "not take a random number of steps before attempting an attack", but animation duration is affected only in Demons and only in chase states. However! In Heretic and Hexen all monsters have their animation duration halved (though still only in chase states) even though none of them have the FAST keyword in any of their states.

[Blue Shadow]

This is due to the [wiki=GameInfo_definition#NightmareFast]NightmareFast[/wiki] MAPINFO flag, which appears to only be enabled for Heretic and Hexen.

[Kzer-Za]

Ah, so that's what it is! Thanks for the explanation!