Quick guide to Ability Haste - League of Legends by doorrace

 Quick guide to Ability Haste (Preseason 2021)

Hey all, in case any of you were not aware Riot is releasing a major overhaul of the current items system. Among the changes that has caused the most confusion is the replacement of CDR with "Ability Haste". It's not a very intuitive name nor concept, so I'll try to explain it in this post.

So what exactly is "ability haste"? In its simplest terms, it is the "percent increase in possible casts per minute". For example, let's imagine an Ezreal standing in fountain spamming Q. With 20 Ability Haste, he will be able to cast 20% more Qs per minute than if he had 0 ability haste, with 40 he will be able to be able to cast 40% more, etc.

On the other hand, CDR operates on the base cooldown, which has an EXPONENTIAL effect on possible casts per minute. With 20% CDR, Ezreal will be able to cast around 25% more Qs within a given time than with 0 CDR, while with 40% CDR he will be able to cast 66.7% more Qs than with 0 CDR. At 80% CDR (URF), Ezreal is able to cast a whopping 400% more Qs per minute. Comparatively, ability haste results in a linear increase in cast per minute. From 0-20 Ability Haste his casts per minute increases by 20%, from 20-40 his casts per minute increases by 20% again. At 80 ability haste, he will be able to cast 80% more Qs per minute.

Another byproduct of this is that Ability Haste has a LOGARITHMIC effect on cooldown reduction. In other words, the more ability Ability Haste you stack, the less it lowers your cooldown. HOWEVER, no matter how much or how little Ability Haste you stack, it will TECHNICALLY increase your theoretical DPS from abilities linearly. A lot of champs may not benefit much from this; for example, many burst mages may choose to invest less into ability haste and more into pure damage, as it would take significantly more ability haste (67 AH = 40% CDR) to match the benefits they used to feel from CDR. However, more DPS or utility focused champs may be able to more effectively utilize the higher possible casts per minute, and may build enough AH that is equivalent to more than 40% CDR. A lot of it will probably be reliant on how gold efficient AH is as well as how prevalent it is in items.

This graph compares CDR vs Ability Haste in terms of percent increase in casts per time.

This graphs compares CDR vs Ability Haste in terms of percentage of original cooldown.

Here is the conversion from CDR to Ability Haste.

Here is the conversion from Ability Haste to CDR.

I hope this clears things up a bit!

SOURCE

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