How much it affects the performance when using "dynamic" ?

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C#

performance

Hello , I just understood that dynamic is unlike the object and can call methods and variables from the instance and not matter which type it is .
I want to know if i can use the dynamic keyword as usual instead of typing the type's name every time which also limiting the pointer for only one type of instances .

Secondly , i want to know much it affects the performance while using a lot of dynamic pointers in my code .

Third question , can i suddenly change the pointed instance of the dynamic pointer to another instance (for example from another dynamic pointer) and it will be quite fast and effective ?

Here some code :

dynamic Instance;
Instance = new Button();
Console.WriteLine(Instance.Text);
Instance = new Panel();
Console.WriteLine(Instance.Padding);
Instance = 10;
Console.WriteLine(Instance);

About the 3rd question :

dynamic A = 10;
dynamic B = "string";
B = A;
Console.WriteLine(A + B); // Expected output : 20

Generally i want to know how much using "dynamic" is hurts the performance of my code . Because i am working on really critical class . But i also need the dynamic pointers (if not then the object pointer which are more problematic)