Question

Overworket ports suffer from low level of efficiency and productivity and so have become costly ports from the users points of view

Answer 1

Explanation:

If you say that something is costly, you mean that it costs a lot of money, often more than you would want to pay. ... If you describe someone's action or mistake as costly, you mean that it results in a serious disadvantage for them, for example the loss of a large amount of money or the loss of their reputation.