Fire Trap + Faster Casting = ?

Hi folks,

In which way does the suport gem "Faster Casting" affect the skill "Fire Trap"? If I understand it right, Fast Casting should have no effect on this skill. The trap laying speed may not be affected, otherwise the passives would make no sense (i.e. +22% Trap Laying speed").

The only effect I can imagine could be the higher rate of the fire damage ticks per second. But. the number in the skill description doesnt get changed, it says always "459 Fire Damage per Second", with and without Faster Casting suport gem.

So now my question: Why does the Faster Casting Support Gem increase the total DPS of my Fire Trap by whole 2500 points, from 12500 to 15000 DPS? The skill description contains no hints about that, nothing get changed if I swap the Faster Casting but the total DPS.

Bug or do I oversee something?

I think the cast speed is reflected in the displayed tooltip, but is not actually applied.

Faster casting works on all of the traps.

afaik casting speed does nothing to traps and its only visual bug that it increases dps. you need trap laying speed.

The trap casts its spell with a given cast time, that's what would be affected. It obviously casts a single time, so the effect is probably minimal for fire trap, being aoe. If anything, the «real» dps increase would probably be the time «saved» multiplied by the dps of the fire dot, i.e. an enemy coming towards you would be sligthly longer in the fire, since the fire is applied faster once the trap is triggered.

For projectiles linked to traps, it might have a bigger effect, though, because of the way traps aim.

Well, then this hugh DPS increase I speake of in the OP is just a bug and needs to be reported (if not already done by somebody).
Faster Casting on traps may have a real effect only if the trap is fired multiple times, not just once. Maybe GGG plans to implement additional Support Gem increasing the firing times of traps, but atm it seems to be a display bug.