Guild Wars 2

From the wiki:

“Swiftness (movement speed increased by 33%; stacks duration) is a boon that provides an increase to movement speed. Other effects that provide a bonus to movement speed (e.g. certain traits and signets) do not stack with swiftness; only the highest increase in movement speed will be applied.”

I’m confused on the bolded portion above as it appears to be in direct contradiction with the ‘stacks duration’ part of this boon’s description. Also, I know of at least a couple cases where swiftness sources do indeed stack.

For instance, if you cross a Mesmer’s Temporal Curtain and then heal yourself while wearing 6xSuperior Runes of the Centaur, the swiftness durations from both sources are added together.

Can anyone help explain this? Is what I’m seeing a bug or working as intended?

What they’re referring to are things like the movement speed bonuses provided by signets and traits. Just like the bolded portion of the description states.

The 25% bonus I get from the Warrior’s Swiftness trait or Signet of the Locust on my Necro don’t stack with the 33% movement speed bonus from Swiftness.

If I however have activated Signet of Rage for 30 sec of Swiftness, then activated Warhorn #4 for 10 sec of Swiftness I’d net 40 sec of Swiftness opposed to 66% movement speed increase.

Boons and Conditions can either stack in duration or intensity.

For boons examples would be Swiftness or Regeneration (duration) vs. Might (intensity).

For conditions examples would be Burning or Poison (duration) vs. Bleeding or Confusion (intensity).

I hope that helps.

the swiftness boon stacks with itself, increasing the duration.
the swiftness boon does not stack with any other movement speed increase.