I recently migrated from my 17″ MBP to the new retina macbook and noticed that the battery life was not what I was expecting. The retina macbook seemed to be running hot and that battery would drain far quicker than expected.
After a bit of Googling I found some discussions on the Apple forums around a hung “dock” process that can get left over after migration assistant runs. In my case I used a time machine backup to restore to the new Retina Mac so I decided to take a look.
I pulled up the activity monitor (global search for activity monitor) and sure enough I had a “dock” process running 100% of one of the cores. I took a look at my battery and had 75% power and 1:35 remaining (of course this is not what is expected with a new MBP).
If you see the same issue on your machine follow these steps to kill the dock process
1. Open terminal
2. Run the following commands (hit enter after each one)
The dock will disappear for a second and then come back and the process should be remove from your activity monitor. As soon as I ran the commands the system slowed down and the CPU usage went way down. As I type the battery says 64% and 3:12 hours – much more like it.
Hope this helps someone.