British turbines and American boilers for a faster Dutch battlecruiser

How much could the Dutch increase battlecruiser speed by buying foreign turbines and boilers in the early 1930s?

Potentially quite substantially, with British Parsons turbines and American boilers offering the strongest combination in his assessment.

The suggested combination pairs British turbines, especially Parsons machinery, with American boilers. By the early 1930s, the United States was becoming especially competitive in boiler technology while British turbine expertise remained formidable. The answer separates two parts of the propulsion plant rather than assuming one country offered the best complete package. It illustrates how a smaller navy could buy specialized foreign technology to improve an indigenous design.