Whether you have an older model that’s getting slow or a brand new Christmas Mac, if you don’t use Dashboard, there is no reason to let it live — kill it, now. Disable Dashboard and you can reduce RAM, battery and system resource usage, and getting it done is surprisingly easy to do.
First of all, navigate to and open Terminal:
Choose a method…
• Applications > Utilities > Terminal
• Launch Pad > Utilities > Terminal
• Spotlight > Terminal
Next, to disable Dashboard, copy and paste the following command into Terminal and hit Return:
defaults write com.apple.dashboard mcx-disabled -boolean YES;killall Dock
In order to re-Enable Dashboard, copy and paste the following command into Terminal and his Return:
defaults write com.apple.dashboard mcx-disabled -boolean NO;killall Dock
The above method will work just fine for folks running OS X Lion.
Those running OS X Snow Leopard, try this method instead.