One very slow. Both mentaly and physically. The "Super" implies that it's an alarming scale.
The Superturtle was so slow he got hit by a car when trying to cross the street.
A turtle that saves the world on numerous occasions , but still when ever YOU need help he wont be there..
"dude did you just see superturtle"
"no why?"
"well he's kinda saving us.."
"oh , cool.."