The article says it is 140 time further from the sun than the earth. So this means the linear speed of earth is is within the ballpark of Neptune and this new objects speeds.
The Earth moves around the Sun at 18 miles per second. Because the speed of an orbit is dependent on the Sun's gravity the further away from the Sun an object gets the slower it actually moves. Neptune moves at 3.4 miles per second. You can rest assure that this new object moves even slower than that