Is there a cap on how much haste affects dots?

Was thinking of stacking expedient on my spriest for even more haste and crazy dot damage during voidform but someone mentioned that just like after a certain amount of haste the GCD is no longer reduced, the same happens with dot damage.

Is there a cap to haste affecting dots? Is that true?

Off the top of my head, there’s no cap to haste affecting DoTs.

If you cast a 10 second DoT while having 50% haste, the DoT will have a 6.6 second duration, but cast 10 seconds worth of damage.

No, the same does not happen to dot ticks. And while the GCD is not reduced after a certain point, the hasted cooldown of shadows spells is, meaning that even after our cast times drop below the GCD haste is still giving value.

If you cast a 10 second DoT while having 50% haste, the DoT will have a 6.6 second duration, but cast 10 seconds worth of damage.

Err not quite right.

Haste just shortens the time between ticks but the duration stays the same.

0% haste: 20 second duration, dmg every 2 second.
50% haste: 20 second duration, dmg every 1.33 second

0% haste: 1.5 second cast times, 1.5 second GCD
50% haste: 1 second cast times, 1 second GCD

For classes that have 1.5 second GCD, the cap would be 0.75 second GCD which is 100% haste. For classes with 1 second GCD, it can’t go below that, and instead they gain resources and auto atk spd from haste as a main benefit. This is from when I last did research on this.

So as far as haste cap goes for us, 100% haste would be cap as far as GCD goes, but it can go well beyond 100% for tick speed and cast speed. If you fight the K’thir mobs in Uldum or Vale and get the haste buff/debuff stacked on you, you can test high levels of haste out for yourself.

Also, no amount of haste is wasted on dots, when the dot runs it’s course, any left over tick duration will be consumed for damage as well.

EX:
5 second dot, ticks every 1 second for 100 damage = 500 damage.
Add 50% haste (33% reduction in cast time and tick interval) = tick every 0.66 second for 100 damage.

Damage Interval
0 0s
100 0.66s
100 1.32s
100 1.98s
100 2.64s
100 3.3s
100 3.96s
100 4.62s
57.57 5s dot ends
0 0.28s leftover thrown out

Total damage = 757, roughly 50% more from 500

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Pretty sure that they got rid of hast breakpoints a while ago, and DOT/HOT duration is actually decreased by haste (along with the faster tick rate) so that you do the same amount of damage, just over less time.

Oh, yeah, that absolutely makes more sense.

Wrong, the extra tick system still exists but its really weird. The tick’s size is proportional to how close you are to the next one.

So what ends up happening is after you hit a breakpoint, a partial tick appears at the end of the dot, which grows as your haste rises until its the size of a full tick, at which point you gain a new tick and a new partial appears. I have no idea how this works with dot extension or pandemic things, I just know it smooths things out overall.

Dot durations are fixed, and haste does not affect them, and the average damage of a dot scales linearly with haste.

I have no idea how this works with dot extension or pandemic things, I just know it smooths things out overall.

Yeah maybe my example is slightly off and the excess tick that runs over gets counted instead, either way. Like Hpellipsis says all that matters is 50% haste = 50% more dmg on your dots.

Ah cool so there’s no cap affecting dot ticks like I hoped.

Question though, does shadowfiend attack speed snapshot based on your haste?
And does the maut trinket do the same?

Both scale dynamically with your stat levels as their duration progresses. Nothing snapshots.

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IDK about trinkets, but essences and corruptions seem to be very fixed and very very little affects them. Only one I’ve noticed is Echo of Light procs off Impassive Visage which is cool