As you know your dashboard is started at system startup which means it consumes extra power of your macbook. If you don’t use dashboard like me you better disable it. Your battery will last longer and you’ll save some memory resources. To disable dashboard fire up your terminal and type this:
defaults write com.apple.dashboard mcx-disabled -boolean YES
Dashboard process is owned by the Dock so we need to restart the Dock to apply the changes.
killall Dock
Now when you hit F12 nothing will happen. Your dashboard is now disabled.
If you want to enable it again type:
defaults write com.apple.dashboard mcx-disabled -boolean NO
Now restart the Dock process by “killing” it:
killall Dock