The Computed Pattern` is a design pattern used to reduce CPU workload and increase application performance by computing values from data stored in a database, storing the results in a document, and avoiding redundant computations. It's particularly useful when there's a high read-to-write ratio and calculations need to be run against data, such as sums or time series data. By using this pattern, developers can optimize their applications and improve performance by offloading computations from the main application logic, allowing for faster page loads and improved user experience.