Guild Wars 2

It means that your projectiles will have… higher velocity. They will fly faster.

reason anet increases speed of projectiles is because if you side step really fast side to side you dodge range attack. by tricking engine of where your position is.

as an example you try standing at 800 range of rapid fire ranger if you step side to side really fast with your strafe keys you notice not a single shot will hit you.

Adding onto Taobella, The increased projectile speed gives them less time to actually react to you. The Deadeye’s most damaging ability can be reflected, and fly back into his own face, and potentially kill him.

His only unblockable attack comes from a cloak and being knealt.

So if they try to reflect they probably need to have that ability up before the deadeye fires.