Not sure why it takes so long but the fact that you have "only" 15MB for the PNG version and 50MB for the JPG version sounds strange. I believe Draw saves PNG and JPG the same way internally, they are both saved with lossless compression in the CDR file. Differences in size may depend on that a PNG can have an alpha channel or that a JPG can be CMYK , but the difference in your case seems to be a bit too much.
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