| English | Welsh |
| Exchange Fast Access | Mynediad Cyflym Exchange (A feature that enables Exchange users to see new email messages and up-to-date calendar items as soon as they open Outlook, without waiting for it to finish synchronizing) |
| fast forward | gwibio ymlaen (To advance audio or video playback at a speed that is faster than normal) |
| fast shutdown | cau cyflym (A mechanism for a MAPI client to initiate a quick shutdown of the client process, notifying all providers with which the client has an active MAPI session to save data and settings before the client process exits) |
| fast startup | cychwyn cyflym (A method of starting the computer that speeds boot time by ending the user session and hibernating the computer, rather than shutting down all running services) |
