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					Originally Posted by  Geremia
					 
				 
				I wonder why restoring the database takes so long. I have about 1300 titles. And Calibre only uses <5% of my CPU when restoring. 
			
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 what 
theducks wrote
I just rebuilt a database for a 986 book library in 2m 51s.  I used Calibre 1.30 (64bit), Windows 7-SP1, internal hard disk, NTFS.  According to the Windows Resources monitor the 1st stage (quickest for me) was more cpu intensive than the other 2 stages, the 2nd and 3rd stages were Disk IO bound with very low CPU usage.
Which version of calibre are you using ?  
Which OS are you using ?
On what media is your library stored ?
Which file system is it?  
BR