The primary reason for increased rendering times is the use of fresnel reflection on the ski. Disabling this will save a lot of time. If you don't want to disable it, consider reducing the reflection quality to save some time.

Eye reflections can also be time-consuming - using the original texture's eye reflection maps (if it has them) will save rendering time.

Of course all these time saving techniques will compromise the quality of the end result, but often the reduction in quality is minimal and the time savings considerable.

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