Optimizing code speed: Hiding rows with loops - looking for faster way

Hello!
The following code hid the rows of the listed cells if the cell does not contain anything if I click on the checkbox in my sheet and unhides them if I click again. The problem is that it needs about 5 to 7 seconds for the rows to disappear and I would like to have it faster. Does anyone have an idea how to get the same result faster? Without that many loop stages?

If Range("B63").Value = True Then
            Set myRng = Range("C4,C5,C6,C7,C8,C9,C10,C12,C13,C14,C15,C16,C17,C18,C19,C21,C22,C23,C24,C25,C26,C28,C29,C30,C31,C32,C33,C34,C35,C37,C38,C40,C41,C42,C43,C44,C45,C46,C48,C49,C51,C52,C53,C54,C55,C56,C57,C59,C60,C61")
            For Each myCell In myRng.Cells
                If myCell.Value = "" Then
                myCell.EntireRow.Hidden = True
                End If
            Next myCell
Else
Range("C1:C65536").EntireRow.Hidden = False

Greetings,
Taktiker