Talking about Lightspeed itself there many FTL speed such like how Frieza and Goku reacted to Namekian Dragon Ball. Namekian Dragon Ball following Namek Race to Earth. Radits transmitted data about his death to Nappa and Vegeta nigh-instantly over deep space with scouter. Goku move so fast even scouter can't made reaction toward him until second later. Goku on Namek was stated by Vegeta to be moving so fast the scouters couldn't pick him up, which is impressive because Raditz transmitted data about his death to Nappa and Vegeta nigh-instantly over deep space. It would take Nappa and Vegeta 1 year to reach earth, while it would take Earth's fastest technology 4339 years and 3 months to reach Namek, and it would take Goku's ship 6 days to reach Namek, which operates on the same Saiyan technology. Vegeta after his zenkai from Recoome most likely replicates this feat next, since he blitzed and destroyed most of the Ginyu force, and could destroy Ginyu using Goku's...