Pre-rendering has no effect on the quality of your final DVD.
However, the program can sometimes use your rendered files as part of the transcoding process, so pre-rendering can sometimes speed the process up a bit.
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As Steve points out, the Rendering is basically for viewing. When one calculates the time to Render, prior to Export/Share vs any timesaving, the total times should be a wash, or very nearly so. The quality will not be any different.
Thanks to you both for your reply.