Speed down, how does it work?

is speed down the same for all characters in terms of how much it slows don't the enemy?
The fives' speed down fix, was that because he was slowing down the enemy more than every other toon slows down enemies? And now he and every other toon applies speed down to the exact same strength?
Or is it actually different for every toon and fives was fixed just because he slowed enemies down more than intended? But it's still different to every other toon?