Unless otherwise specified, tempo should remain consistent and controlled across exercises.
Whilst many will give time recommendations such as 3 seconds down, 2 seconds up etc. we’re not convinced having to count whilst you are performing reps is going to allow you to put all your effort into lifting the weight.
Instead, when you are lifting the weight with gravity, you should do so in a controlled manner. This is also known as the eccentric portion of the lift. When you are lifting the weight against gravity, you should also lift in a controlled manner but with as much force as possible. This is known as the concentric portion of the lift.