This variable controls the vertical movement speed of the view
when it has an instance to follow (this can be set with the
view_object variable or in
editor). Care should be taken when setting this value, as
setting it too low can result in the instance moving faster than
the view can and so it may disappear out one side of the view until
it stops and the view catches it again.
view_hspeed = view_object.hspeed;
view_vspeed = view_object.vspeed;
The above code sets the speed of the view following to be the same as the currently selected follow object.