You will have a substantially longer take off and landing roll and you will need extra speed round the circuit and on final.
Hopefully you've been flying the aircraft's correct speeds, you do not need to increase them during normal maneuvering, when operating within the circuit or not. Never fly an aircraft on approach at speeds higher than the manual recommends which you have hopefully been doing. When operating the average four seat aircraft it is unlikely that the recommended approach speed need to be varied. Remember the point of the approach is to eventually stop. Always refer to the manual of course.