speed up your renderings by doing a few simple things

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First, make sure antialiasing is unchecked in the Rendering > Raytracer Settings > Raytracer/ Global Ray Antialiaser menu when you're doing test renderings, then turn antialiasing back on when you're doing your final production rendering
.

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Fourth, keep your Raytrace material as one-sided instead of two-sided, unless it's absolutely necessary to represent surfaces such as thick glass.

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نريد المزيد من هذه المعلومات التى تقلل وقت الرندرنج

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Third, if you don't need to keep the modifier stacks active for some or all of your scene objects, then collapse them to the modifier stack results (preferably Editable Meshes).

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If you go to the Rendering > Raytracer Settings > Raytracer tab, you'll see that the default Ray Depth Control (Maximum Depth) is set to 9.

turning this setting down to 2 or 3; it will render much faster.

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http://www.expertrating.com/coursewa...endering-3.asp