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I have been running calibre on Win 7 since V0.6.xx. Mine is a 64 bit setup on 2 machines and 32bit on my laptop. Processors range from 8 (16 with hyperthreading) on one machine, four on another and 2 on my laptop. RAM ranges from 12G on the 8 processor machine to 4G on the other 2.
The only problem that I have experienced was during installation (something to with cost), but even that has gone away with 0.7.17.
Never noticed any slow performance from the application itself (300 books). If anyone can tell me what info they would need from my setup, I would be happy to provide that seeing that I do not have the issue stated by johnwayneb.
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