Originally Posted by cocheese
DPET <> DPS
DPET determines the priority of an ability. How much damage is dealt by the ability relative to the time it takes to execute it.
DPS determines the throughput of an ability. This is the rate at which the damage is applied.
For a direct damage attack DPS is equivalent to DPET because all of the damage was dealt in the same amount of time as it took to execute the action.
For a damage over time effect however, DPET is always greater than DPS. For example...
You have an 2 second cast that does 30,000 direct damage. The DPS of this ability is 15,000 and the DPET of it is also 15,000.
You also have a DoT that ticks for 5,000 damage every 2 seconds and has an 12 second duration and is an instant cast. That DoT does only 2,500 DPS. However, the DPET of it is 20,000 assuming no haste at all so a 1.5 second GCD.
The direct damage attack does 12,500 more DPS than the DoT, however, the DoT is a higher priority because you will do more total damage relative to the 1.5 seconds it takes to execute when compared to the 2 seconds it takes to execute the other cast.
The DPS of an ability does not determine it's priority, the DPET does.
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