One of the grand new features in OS X Mavericks is App Nap, which saves on power to extend battery life on MacBooks. One of the unfortunate side effects is that is kills background rendering in Final Cut Pro X and other apps that take advantage of background rendering.
To make background rendering work again, simply turn off App Nap. The process is simple.
- Right-click on the application.
- Choose Get Info.
- Check the box “Prevent App Nap.”
- Enjoy background rendering again.
This is one of those features that should only be active when installed on a laptop. I don’t know why Apple can’t write their OS to differentiate between a desktop and laptop for these sorts of things.
Christopher Fugle says
It would appear that this fantastic tip also applies to Aperture 3 on the Mac as well.