how detailed should a mockup be to ensure efficiency without slowing down the process?

Mockups play a crucial role in the tech industry, especially in UI/UX design, helping teams visualize the final product before development. They save time, reduce misunderstandings, and allow for early feedback. However, I sometimes wonder: how detailed should a mockup be to ensure efficiency without slowing down the process? Should designers focus on high-fidelity mockups, or are low-fidelity wireframes enough for early stages? Would love to hear different perspectives on this!