It is not necesary to render a preview before exporting.
On a fast computer Pr can often preview your project without rendering very well.
But, if you add several effects to a clip, it sometimes will not preview well (very slow or jerky). In that case, in order to see how you project works you may render a preview so it plays smoothly.
"Then, what is the benefit that I render (by pressing Enter) first before I export?"
If you have rendered a complex editing job and then check "Use Preview Files" it can make an appreciable difference in the render time. I had an extremely bad lighting situation on over an hour-long two-camera shoot that required alot of color correction. It took 6 hours and 14 minutes to render to MPEG2-DVD without the preview files and only 42 minutes with the preview files! And this was with 8-cores. Of course there is a debate as to whether the end result with preview files is as good as without using them.
If you have rendered a complex editing job and then check "Use Preview Files" it can make an appreciable difference in the render time.
I wonder if that is true. What is the difference in time when you compare the preview rendering plus the final rendering in comparison to only final rendering?
Put it another way, if you have a dozen oranges and decide you want to press three to see how the orange juice looks (preview render) and later decide to press the remaining 9 oranges as well (final render), would that be any faster than simply pressing all 12 oranges for final render?
Harm, I was not advocating rendering to decrease the total time. Only if you have to render to "proof" you editing is it really worthwhile using the preview files. In that specific case I did some of the timeline rendering while editing for myself and then did the rest as I wanted to show the best edited full high definition preview to someone before I cut it back a lower resolution on a DVD disc.
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