

In-Geom with 10s or less base cooldown skills or items such as Aether Walker and Frydehr's Wrath), it instead gets unreducible 0.5s cooldown.ĬDR affects only your active skills cooldowns on your passives (such as Spirit Vessel) and on your Potion always stay the same. One consequence of this cap is that when skill's cooldown is supposed to be reduced to 0 (e.g. There's a cap to CDR's effectiveness: neither percentage nor flat CDR can reduce the cooldown of a skill below 0.5s, meaning that above formula can be more accurately written as: One exception to this rule is Witch Doctor passive Tribal Rites: it changes the base cooldown on the skill and is calculated before flat CDR. Flat CDR is calculated before percentage-based one: Instead of reducing the cooldown by a portion of base value it just straight up subtracts a certain number of seconds from it. becomes 2 times shorter.įlat Cooldown Reduction is a lot more rare and usually only affects specific skills. Which means that when we add the second source of CDR, the cooldown goes from 50% of the base value down to 25% i.e. For example two separate sources of 50% CDR will stack together giving us 75%. This means that there's no diminishing returns to CDR and that each separate effect does exactly what it says on the tin: "Reduces cooldown of all skills by X%". Regardless if it's general or skill specific CDR, all separate sources of it stack multiplicatively with each other. On top of that, there's also CDR that only affects certain skills. This CDR is the one that's displayed in your details sheet.

Percentage CDR reduces the cooldown of your skills by the specified percentage: The former is the most widespread one and it comes from a lot of different sources. This guide will cover all different sources of CDR and RCR and other similar effects, rules for their stacking, as well as different item and skill interactions.ĬDR comes in two varieties: percentage based and flat Cooldown Reduction.

Although some items give skill or element specific CDR or RCR and that is not displayed in any way. You can find your current CDR and RCR values on the UI, CDR under offense section in details sheet and RCR in the resource section further below. The former lets you use your skills more often while the latter makes them consume less resource. Cooldown Reduction (CDR) and Resource Cost Reduction (RCR) are utility stats in Diablo III.
