If you select Timing, the preview box tells how long Photoshop took to perform the last operation (including background tasks, such as transferring an image to the system Clipboard). Adobe may have added this option to help testing facilities run their Photoshop tests. But built-in timing helps you as well.
For example, suppose you're trying to decide whether to purchase a new computer. You read a magazine article comparing the newest super-fast system. You can run the same filters with the same settings on your computer and see how much slower your results are, all without picking up a stopwatch.
At the risk of starting interoffice feuding, the Timing option also provides you with a mechanism for testing your computer against those of coworkers and friends. The Timing option serves as a neutral arbitrator, enabling you and an associate to test identical operations over the phone. Like Efficiency, Timing is a reality check. If you and your associate own similarly configured computers and your Timing values are vastly different, something's wrong.
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