Use notes selectively. Writing down a few key variables or decisions can save time if it prevents you from repeatedly searching the screen.

Notes become a problem when you copy information instead of using them as a memory aid.

If you need to compare several values across a task, writing the two or three important numbers with labels may be faster than reopening information repeatedly.

During practice, test a minimal note format and keep only the information you expect to reuse. If useful, this guide on McKinsey Solve guide gives more detail.