Speed up Time Machine backups

Time Machine backups are great, but very slow when a large amount of data/files needs to be transferred (such as the initial back-up). As designed by Apple the Time Machine background process is running in a very low CPU priority, giving all other running applications en services priority.

With the following Terminal command you can temporary speed up the Time Machine backups:

Disabling Priority Throttle

sudo sysctl debug.lowpri_throttle_enabled=0

The command prevents Time Machine’s backup process assuming a low CPU priority, allowing backups to complete more quickly.

The command is not persistent and will become inactive after a reboot. If you want revert to the default setting without a reboot:

Enabling Priority Throttle (default)

sudo sysctl debug.lowpri_throttle_enabled=1