Does Swiftness stack with Signet of the Hunt?

The latest patch increased the passive effect of Signet of the Hunt from 10% to 25%, which is a noticeable increase of speed. Before the patch, however, I was using 6x Superior Rune of the Centaur, which increases the duration of all swiftness effects by 20% and gives you 10 seconds of swiftness (before the 20%) when you cast a heal.

Since the patch though, I can see the graphical effect for swiftness when I gain it, but I don't seem to be moving any faster than the base movement speed increase I get from Signet of the Hunt.

Does Swiftness stack with Signet of the Hunt?