Static class loading and dynamic class loading

[jose chiramal]

Which is faster and why : static class loading or dynamic class loading.

Which is faster and why : in case of jsp, static include or dynamic include.

I feel in case of dynamic there is a runtime overhead. Is this correct ? Also what does runtime overhead actually mean

[jose chiramal]

Dynamic class loading example :
Class.forName (String className); //static method which returns a Class.

When we say a class is "loaded dynamically" what does that mean ? In such cases is an instance of the class created ?