Effect of Cast Speed

Does anyone know if “Cast Speed” increase the rate of fire of automatic spells, such as Chtonic Fissure? The in-game info is silent.

Not sure about Chtonic Fissure, but Smite auto fired from Warpath gets no benefit from cast speed. If the spell is triggered, from what I can see, it’s instant cast and doesn’t benefit or degrade from cast speed.

There is no animation when auto cast either, but I say that not knowing if it really matters and how LE handles animations and actual cast throughput the same as other games…looking at you GGG!

To my knowledge cast speed only works with non-channeled spells that you directly cast unless stated otherwise spesifically in the tooltip of the related spell, talent or passive.
Eg. Profane Orbs cast by Profane Veil state cast speed increases frequency.
Also cast speed does increase how quickly you start a channeled spell but not how fast they tick (the initial animation is shortened).

Thanks!