Offhand Cooldown Modifier isn't reducing correctly

cuatro · Sep 18th 2018, 1:24pm

I dont believe the offhand cooldown modifier is actually reducing the cooldown based on item power.

imgur.com/a/sLXJUpL

In this picture the top portion shows no offhand and the cooldown time is 2 seconds.

In the lower picture the t8 torch is equipped where it shows it should have an 8.2% cooldown reduction but the inventory detail stats screen only shows 7.6%.

The tooltip shows the actual cooldown is 1.85 seconds which is also 7.6%: (2 * (1-0.076)) = 1.848 = 1.85 instead of the 8.2% cooldown of 1.84: (2 * (1-0.082) = 1.836 = 1.84

Thats trivial in this example but for larger cooldowns this could be more meaningful. At the very least the item stats and detailed stats don't make any sense.

cuatro · Sep 20th 2018, 3:40pm

here is a clearer example using a 7.1 mistcaller and the cooldown on a merc jacket bloodlust

imgur.com/a/2j2fsv1

Source Code

Base Cooldown Time = 60 seconds
What cooldown should be based on detailed info with a 14% reduction
(1-0.14) * 60 = 51.6 seconds
What cooldown should be based on item info with a 16% reduction
(1-0.16) * 60 = 50.4 seconds
Actual Tooltip value shows 51.76 seconds

Something is definitely not correct here. 1.2 seconds could be a big deal in a close battle.

Bigshoes · Sep 20th 2018, 3:50pm

There's diminishing returns on cooldown modifier, so when the items are all equipped you get less then adding together each item individually.

MEATCUP · Sep 20th 2018, 5:08pm

Bigshoes wrote:

There's diminishing returns on cooldown modifier, so when the items are all equipped you get less then adding together each item individually.

I think it's just one item..

cuatro · Sep 20th 2018, 6:12pm

MEATCUP wrote:

Bigshoes wrote:

There's diminishing returns on cooldown modifier, so when the items are all equipped you get less then adding together each item individually.

I think it's just one item..

Correct. There is only 1 thing equipped that has a cooldown modifier so diminishing returns should not have any effect.

Bigshoes · Sep 21st 2018, 12:40am

My bad, that's intriguing. Hopefully a dev can shed some light

cuatro · Oct 2nd 2018, 4:36am

Any update?

Lars024 · Oct 2nd 2018, 10:31am

I believe the calculation is wrong in that cooldown modifier makes cooldowns go faster. not reduce the cooldown.
as example, lets say a cooldown is 60 seconds like you calculated with. it regens at a speed of 1/60th cd per second.
Now what the difference is here is that the 60 is not reduced but rather the 1 is increased.
This gives us a regen of 1.16/60th cd per second. making the total cd time 60/1.16 = 51.72s which is very close to the value you experienced and can be explained by the actual item having more decimals that aren't shown on the tooltip.

I can't confirm this is how it works but it seems very likely.

cuatro · Oct 2nd 2018, 3:13pm

Lars024 wrote:

I believe the calculation is wrong in that cooldown modifier makes cooldowns go faster. not reduce the cooldown.
as example, lets say a cooldown is 60 seconds like you calculated with. it regens at a speed of 1/60th cd per second.
Now what the difference is here is that the 60 is not reduced but rather the 1 is increased.
This gives us a regen of 1.16/60th cd per second. making the total cd time 60/1.16 = 51.72s which is very close to the value you experienced and can be explained by the actual item having more decimals that aren't shown on the tooltip.

I can't confirm this is how it works but it seems very likely.

Interesting that math makes sense then, in which case the detailed stats display is just showing an incorrect value which is just cosmetic.

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