ActionScript 3.0 :: Do Dynamic Classes Affect Performance

From what I hear, getting/setting dynamic properties is a lot slower than regular properties.

But does allowing a class to be dynamic slow down the entire class for regular property getting/setting?

For instance, let's say I have this class (pretend those properties have setters as well):

Code:
public dynamic class Hero
{
public function get endurance():int
{ return _endurance; }

[Code].....

Obviously, calling and setting the "magic" property will be a lot slower, but will all properties become slower to get/set just because the entire class is set to dynamic?

Is it better to not set the entire class to dynamic, and instead create a new dynamic object, "additionalStats" where properties can be get/set to instead?