Why is the "Airlock Screen Locker" using so much CPU?

On some machines, the crawling barber-pole animation of the Airlock lock-screen can cause unusually high CPU usage. You can work around this problem by enabling the screen saver feature (in the "Actions" tab of the preference pane), which disables the lock-screen animation. You'll likely want to use a simple screen saver to avoid high CPU usage, such as the "Computer Name" screen saver.