The trouble is that Calibre is written in Python, possibly the least-efficient "programming "language there is. On my Windows 7 Toshiba laptop, Calibre is using almost 500 MB of RAM. There are 4 Calibre-parallels running and 4 Conhosts as well. This is the biggest piece of bloatware I've ever seen. And all it is doing is loading a few thousand books. It has been going for over an hour now and is just halfway through. So how many days is it going to take it to convert these PDFs into ePubs? Python is for script-kiddies, not serious programming.
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