Update: The document originally recommended disabling Bluetooth, but it appears updating to the latest version of OS X is Apple’s recommended fix. Much better.

In a support document issued today, Apple addressed a known issue with AirPlay Mirroring performance freezing or dropping out. MacBook Pro and Mac Pro users with last year’s models may see the issue when using an 802.11 b/g network…

Sony A6500

Apple’s solution? Disable Bluetooth. For Mac Pro users, that means breaking out the wired mouse and keyboard as it has no integrated input and turning off Bluetooth means disconnecting the signal from a Magic Mouse and Apple Wireless Keyboard.

Since the issue seems to be constrained to 802.11 b/g networks, upgrading your network base station might be a better solution.