Do not render User Control if not Used

Hello,
I have  5 usercontrols registered in my webpage.
But I am only using 1 of them on any case, but when I debug it
I see that all of them is being rendered even if I put a reference in the page or not.
 
So is there any way to get rid of rendering user controls if they registered on the page but not created in <forms> tag?
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