calibre-parallel.exe is a short lived worker process. A couple of them are kept idling around and when a new job starts it si assigned to one. If you are seeing excessive memory consumption, it means one of the news downlaod jobs (or conversion) is causing it. Just let it run, once the job completes, the process will be killed automatically.
And if you want to find out which one it is, download all your scheduled news one by one manually.
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