Faster Casting

Would like to know the math behind Faster Casting. I'm thinking of putting Spell Totem with Faster Casting and some other spell (let's call it X for now).

Let's assume Faster Casting's at level 1, with no extra quality (20% increased cast speed). Spell Totem reduces cast speed of the spell by 30%. How is the final cast speed calculated?

Would it be:
1.00 - 0.3 + 0.2 = 90% cast speed

or would it be:
0.7 * 1.2 = 84% cast speed

I'm assuming that Spell Totem's 30% reduction is always taken into consideration first, seeing that it is the one casting the spell, while Faster Casting is the support (weird, seeing that Spell Totem itself is a support spell as well) here, but I could be wrong. Also, how does cast speed passive skill nodes get added into the calculation (again, a question of whether it adds to the sum, or it multiplies)?
reduced is not multiplicative (less is but thats not here).
so it is: basespeed *(1 -0.3 +0.2) -> base *0.9
soul4hdwn wrote:
reduced is not multiplicative (less is but thats not here).
so it is: basespeed *(1 -0.3 +0.2) -> base *0.9

Great, thanks a lot!
Faster Casting is currently bugged with Flame Totem. At level 1 it works fine, it increases the totems casts per second by 20%, but levelling up the Faster Casting gem has no effect on the totem's cast per second rate.

[edit]: It's working correctly now. @Vipermagi: 1% is enough to make a difference, the casts per second is calculated to two decimal places.
Last edited by skevoid on Nov 12, 2013, 12:21:04 AM
1% is simply not enough to make a difference. Keep leveling the FC gem, it'll reduce the Cast Speed further eventually.
why does faster casting still work with auras? It unnecessarily increases the aura's cost. Even when linking spell totem with auras, 2.0 made it so that faster casting doesn't affect totem placement speed.
My summoner guide:
My shop thread:
GGG has always allowed players to create setups that are generally "pointless". Just because Added Fire Damage links up to Fireball, that doesn't make it useful. However, because it's not in conflict with the game's rules, it is still a valid link. The same goes for Auras and Faster Casting.

Also, the Totem still activates their linked Aura faster. There is a tangible and real effect.
Last edited by Vipermagi on Sep 11, 2015, 11:37:18 AM
Please change this gem to do more cast spead instead of increased to align the benefit with other often used support gems.
I think, it's currently used for levelling and movement skills only and way inferior to Spell Echo which will also have it's Plus verion soon.
My builds:
3.8 75/75 block 7.5k HP Zombie/Skeleton build:
Last edited by zVisior on Nov 22, 2019, 5:11:09 AM

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