Yes it's possible. All nodes involving movement from one place to another have a velocity modifier which is applied to the NPCs standard move speed. A value of 1 keeps the speed the same as default, a value < 1 slows them down, a value > 1 speeds them up.
e.g. a value if 0.25 will mean they will move at 25% of their normal speed. A value of 1.5 means they will move 1.5 times faster than normal.