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Graphics Acceleration, CPU usage, and Laptop Batteries

If you using a Retina Display on a Mac machine, and find that Postbox is using too much CPU as a result of graphics acceleration, you can try setting a hidden pref which toggle optimization for battery life vs. performance.  

  • Go to Preferences / Advanced / General / Config Editor.
  • Type in layers.acceleration.disabled in the text field at the top.  
  • Double click the row that displays below and set this value to a different value.
  • Restart Postbox.