I detected this when I created some users manually. There is a "Create and continue" button to create more users easlily. It would be much more easy if the fields get populated with the values that were just submitted. Some values (name and so on) are likely that they will be changed - they could be cleared, but other values like the Time Zone will likely be the same. These latter values could be re-populated.

This could be implemented for different forms (there is an issue for issue creation already: #7623). E.g. project creation, group creation... I don't know where those buttons exist.