• Update to version 2.74

This blender release comes with a couple of major improvements, such as

• memory and speed improvements for cycles rendering
• DoF and ambient occlusion support for the 3D viewport
• massive improvements for particles and hair
• a new cavity mask for texture painting
• and many more

Changelog: http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.74