Engineer swiftness in combat
You are observant.
Engineers can get pretty much perma-swiftness from http://wiki.guildwars2.com/wiki/Rune_of_the_Centaur
if they spam their med kit and med kit 5 skill.
(I’ve heard that other classes can get perma-swiftness much easier.)
Engineers can also get a short-term speed boost different from swiftness called haste
from http://wiki.guildwars2.com/wiki/Super_Speed
Haste gives doubles movement speed while swiftness only increases movement speed by 33%.
Engineers also have several other ways to get swiftness, including a trait that grants it for crits and another trait that grants it for just switching kits every 5 seconds.
That’s not swiftness, it’s the Slick Shoes toolbelt skill Super Speed. It’s 5 seconds of “out of combat with swiftness” speed, even in combat. It says it gives double, but that’s only accurate when in combat. Out of combat it’s equal to swiftness.
Swiftness works in combat for everyone, it increases your speed by 33%. Your base speed is just lower, so the total bonus isn’t as big as it is out of combat.
(edited by Haette.2701)