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Please see this topic: http://forums.sketchucation.com/viewtopic.php?f=80&t=37621&p=332148&hilit=render+choice#p332148
I'd suggest you take a look at the TWR Forum, where you - among lots of other things - can find the Best Of Tips and Tricks - The Master List... π If you're a licensed user you will also have access to many resources at the "Red Carpet Club"...