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Originally Posted by audeojude
What is the system specs for your computer that it is taking that long to do a conversion and what format to what format? how many pages? It would be interesting to get a feel for the impact of hardware and memory on calibre's performance. I guess it would be combination of how many files on the file system (OS files system speed issue), memory and architecture (32 or 64), type of hard drive (IO), type of format to format conversion issue, etc
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Latest gen (Skylake) quad core i7 with 16GB RAM running 64-bit Windows 10, converting ePub to AZW3. I tend to buy all the Delphi books as ePub, and then convert them to AZW3 for my Kindle, because they're easier to edit as ePubs. The Calibre conversion worker processes get up to about 6GB RAM during some conversions (I've never seen them go any higher than that). Conversion times seem to depend a lot on the complexity of the source rather than just its length: I've had books that are double the length of others convert in less time.
One of the recent long conversions I've done was the Delphi "Complete Works of Edgar Wallace". 70MB ePub which took about an hour and a half to convert to AZW3.