ToME: the Tales of Maj'Eyal

The effect simply freezes the game completely...
And wrenchlings come in packs...

25 frames in 1 seconds = 25 FPS (30 keyframes)
25 frames in 1.001 seconds = 24.975 FPS (31 keyframes)
[LOG] Wretchling casts Corrosive Vapour.
[LOG] Wretchling hits Splat for #GREEN#22.61 acid damage#LAST#.
1 frames in 1.861 seconds = 0.537346 FPS (27 keyframes)
1 frames in 1.119 seconds = 0.893655 FPS (56 keyframes)

Uh .. that's with reduced particle density setting ?

Nope, full. But this effect almost forces you to play with reduced density...