In For the Kill 40% skill speed not working

Rake .85 s attack speed. When near a rare with an open would the 40% brings rake down to .75 s attack speed. Did GGG mess up on the math? Because the math ain't mathing. Rake should be .51 s attack speed.

At least the movement buff gives me 20%. At least that part is working.

Spear stab: .33 s

Near a rare: .26 s

Should be: .198 s


GGG?

You either multiply attack speed by 1.4 or divide attack time (0.33 in the second example) by 1.4. Your multiplying attack time by 0.6 makes no sense.

0.33/1.4 ≈ 0.23

↑ This would be correct if you didn't have any attack speed (global) increases/reductions. Skill speed and attack speed apply to the same value (attack time), so their increases are additive, not multiplicative, as you thought.

Path of Exile 1&2 are very specific with their wording. You are treating the Ascendancy as if it's a "More" multiplier and not an "Increase". Which is understandable, there's a lot of new players and even some old ones who don't understand how the wording in Path of Exile 1&2 work. So let me explain.

1. Increased/Reduced - It's additive/subtractive. All increases/reductions in a category are totaled together to make one giant stat that is multiplied against the base stat before any modifiers. Increased/Reduced is always calculated before any More/Less multipliers.
2. More/Less - Means It's multiplicative, and multiplied against the final stat. More/Less is always used at the end of the calculation, making it significantly more powerful than increased/reduced.

The Ascendancy reads:
20% increased Movement Speed while an enemy...
40% increased Skill Speed while an enemy...

This means they are both additive because it uses the wording "increased." Let's focus on just the Skill Speed portion of the node. Skill Speed, Cast Speed, and Attack Speed are all in the same category.

Attack Speed affects the speed of the attack.
Cast Speed affects the speed of the cast.
Skill Speed affects the speed of both attacks and casting.

Since you are using attacks, the only 2 stats relevant here are Attack Speed and Skill Speed. The 40% increased Skill Speed from the Ascendancy will be added to all other sources of Increased Skill Speed and Increased Attack Speed you have, from your Passive Skill Tree, Gear, Jewels, and Support Gems. That final number is multiplied against your base attack time before any modifiers.

Base Attack Time x (Current Increases + 40% increased from the Ascendancy)

This is why your getting less than what you expect. Your math would be correct if the skill said 40% More Skill Speed. Then the calculation would be:

Base Attack Time x Current Increases x 40% More from the skill.