Kernon has posted aÂ a tutorial on efficient preview rendering at CG Cookie.
Preview rendering is an important part of your workflow and needs to be as efficient as possible. It's important to have strategies and techniques for the earlier stages of scene development that facilitate a smoother workflow. The less time you spend waiting for renders during the early phases of a project, the more time you'll have for fine-tuning and testing, resulting in better final results for your project. In this article, we'll take an overview of some of the different tools and techniques that are available in Blender to help you be more efficient with your preview rendering.