What are the limits of traditional computing?

Some things seem simple but are very complicated to solve. For example, a salesman needs to visit several connected cities. So how can he achieve the shortest total distance? The increase in the number of cities would daunt even the most powerful electronic computers. In the 1940s, Shannon, the father of information theory, proposed the physical laws followed by the storage and transmission of information (existing in the form of bits). No traditional computer can surpass this law. So, in terms of engineering, how powerful a computer can we ultimately make? However, non-traditional computers, such as quantum computers that have emerged in recent years, may not be subject to these limitations.