Explicit Dart type declaration and performance?

Question

Dart

If you declare a variable like:
1)
var number = 1;
2)
dynamic number = 1;
3)
int number = 1;
4)
num number = 1;
4)

const int number = 1;
final int x = 2;

Q:
Is 2 faster than 1?
Explicit type specification will speed up execution?
is int faster than num because it's less extensive in terms of values?
Difference between final and const for performance?