Execute effects and the use of cooldowns
Since the introduction execute-like mechanics such as hammer of wrath and molten fuy there has been a long-standing assumption that the optimal time to use bloodlust and other dps cooldowns is during the period at which dps is at its greatest; namely below 35% health. This article will show that this is incorrect and that, infact, there is no noticeable difference in the total fight length regardless of when bloodlust or trinkets are used. When there is a difference it may favour early or late cooldowns, depending on the circumstances.
The major consideration of this discussion is: When is the best time to use bloodlust? As bloodlust is the only raid-wide fixed duration dps cooldown, it enforces a raid-wide synchronization of dps cooldowns.
Note on links
Many of the posts linked herein are from the benefactors bar forums, non-members will not be able to see the original posts. These links are prefaced with Benefactors Bar
The correct time to use dps cooldowns, when there are no other extraneous factors, is at that point when the raid can leverage the most fixed-duration cooldowns simultaneously. Execute is not such a cooldown as its duration is not fixed. This will normally mean using cooldowns early in a fight when it is easier to synchronise across the entire raid.
The exception to the above is when a boss fight is such that a specific phase needs to be completed in the shortest possible time (a la C'thun, M'uru/Entropius, RoS... etc.).
Early use of DPS cooldowns can cause problems for classes with aggro-reduction abilities on a long cooldown. One solution is to ensure at least one of your rogues/hunters keeps their aggro-redirection abilities for during the burn period when their damage, and hence transferred aggro, will be maximized. Alternately, save the cooldowns for 85-80%.
(1) Use cooldowns simultaneously.
(2) Obeying (1), use cooldowns early to maximize the number of people and cooldowns available,
(3) If one particular phase needs to be burnt through in the shortest possible time, use cooldowns during that phase, still obeying (1).
[top]Results from Simcraft
The following results were found from SimCraft (simulationcraft - Google Code), the files are attached the end of this article.
The Biggest winners/Losers are Warlocks and Hunters, even mages see a net change of less than 50dps between early and late BL. Note, warriors, paladins and deathknights are not included. This Simcraft calculation shows that there is only a 0.056% difference in average raid dps (and therefore fight duration) between using bloodlust early and using it late; this supports the hypothesis that there is negligible difference in the fight length when BL is used below 35%.
[top]The Mathematics of Execute
[top]Proof for multiplicative trinkets
[top]Proof for additive trinket effects
[top]Proof that trinkets should be stacked with BL
Though the results are counter-intuitive there is a (relatively) simple explanation for them. Unlike other dps enhancing effects, execute scales with the mobs HP, and so can be modelled as a flat reduction of the mobs HP; if below 35% every point of damage effectively becomes X points, then the monster's effective hp are scaled by 1/X. If we apply execute as a HP change, not a dps change, it becomes obvious that it does not matter when we BL.
This point was first raised by Shalas:
Benefactors Bar: http://elitistjerks.com/f30/t11107-i...9/#post1089860
Some further examples for those who doubt math:
This model makes a number of assumptions, the largest of which is that multiplicative effects (such and bloodlust) are symmetric above and blow 35%, when this does not hold then the their use will within execute range can change the total fight length. However, it does not mean that it is always the correct to use them during the last 35%:
[top]No Bloodlust in the raid
There is a small advantage to splitting trinkets when the raid has no bloodlust at all. In this situation, those without an execute multiplier on damage should trinket early, and those with such a bonus should trinket late; again, the difference is marginal. This only applies to a fight length shorter than trinket CD, otherwise one could double trinket early and late.
This discussion was first raised by Binkenstein in the benefactors Bar, who placed it in his blog:
- Benefactors Bar: http://elitistjerks.com/f30/t11107-i...8/#post1088118
- Bloodlust & the "Execute" Talents - Elitist Jerks
The mathematics of the starting models were developed by Wraithlin and Ichal.
- Benefactors Bar: http://elitistjerks.com/f30/t11107-i...0/#post1091180
The assumption of symmetric bloodlust effect was noted by Zakalwe.
Examples were calculated by Shalas, Wraithlin, Songster, Mearis, Neveats, MatsT and others.
Benefactors Bar: http://elitistjerks.com/f30/t11107-i...9/#post1089860
Benefactors Bar: http://elitistjerks.com/f30/t12376-r...8/#post1139701
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Wonderful post, although there are a few things I would like to add.
I think that there are two diffrent kind of cooldowns: haste and damage cooldowns.The diffrence between them is that it is useful to stack haste + damage cooldowns at the same time, or damage + damage cooldowns. Although, stacking haste + haste is not worth it, according to my calculations/
Lets take for example a frost mage who is spamming frostbolt. Now assume that he is totally naked and is only wearing [Scale of Fates]. That means that his only haste abilities are Icy Veins and [Scale of Fates]:
By using it early, it will decrease the amount of time that you can't use any execute effects. In other words: if you use it early, you can start earlier using execute effect against the boss. Which will result into a quicker death (I am sorry but I havent tested this yet, will come soon hopefully.)
You need to be careful when doing math for stacked Haste effects. Effects that increase HR are additive with each other. Most other affects (and I assume that Icy Veins is in that category) are multiplicative. Changing your
3/(1+.132+.2) = 2.25 sec cast
3/(1+.132)/(1+.2) = 2.21 sec cast
would reverse your conclusion.
Spellcasters whose rotation has an instant-cast (or a 1.5s cast) spell, have a soft haste cap at just 50% haste, which is very easy to reach, particularly with Bloodlust. Depending on your gear and complete rotation, you might have a reason to avoid stacking haste cooldowns.
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