Here's what Apple says that will show you how Timer Coalescing works. It's an energy-saving technique that promises to extend battery life on your Mac laptop by forcing the laptop's CPU into a low-power mode whenever it's available. Of the many advanced technologies being introduced in OS X Mavericks, one of the most useful for Mac laptop users is Timer Coalescing. OS X Mavericks will use a technique called Timer Coalescing to make the most of this downtime, and that means battery life will last much longer. A lot of the time your CPU isn't doing anything, and we're not just talking about when you're away from your keyboard - even when you're working, the CPU could be powered down but isn't.
