Many holes not using instance method slowing me down what fix?

I have opened an early project which despite the object being not that complex is slow to perform tasks on, as if my processor has gone slow, at the time I made all the rivet holes each as a new hole, not using the instance method, being unaware of it back then. How do I speed this item up now ?



Hello - I am not sure I undertstand what you are asking - what is the ‘instance method’ of adding a hole?