I don't think they are faster than light at the beginning of DBZ because light can travel around the Earth 7 times in 1 second. When Goku first demonstrated the Instant Transmission move, the characters were surprised that he was able to go to Master Roshi's house and back in such a short time. This means that Raditz could not have been faster than light. If he were, then everyone should not have been surprised with Instant Transmission, since by that time the Z Fighters are stronger and faster than Raditz. So my question is, how fast are the characters at the beginning, middle, and end of DBZ?