How come it takes several days, weeks, or months and many many episodes for everyone to collect all 7 dragon balls in every instance prior to and after the Frieza saga, but Mr. Popo rounds them up in less time than it takes for Namek to explode after Frieza destabilizes its core?
Because this nigga is hella strong, he just doesn't give a shit.
According to official powerlevels he was stronger than anyone in DB. And you know why he didn't slap King Piccolo's ass?
Fuck you, that's why.
Popo has a magic teleporting flying carpet.