To be honest, Calibre takes quite a while to run on my laptop. However, that is mostly due to a slower harddisk than CPU. Otherwise it works fine. I manage my books in it and that's it. I don't do conversions with it, so no experience on that side.
I think it is rather rude to rant like this. If you find a problem/bug, create an issue so Kovid and Co can work on it.
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