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The sort keys for the sub-sorted columns are now only evaluated on demand. The common case is that the keys from the first column will differ, therefore we can speed up sorting on average by delaying evaluation of the sort keys for the second and later columns, only evaluating them when the sort keys of the first column for a particular book differ. The gains will be particularly noticeable for columns where calculating the sort key is expensive, like composite columns or the series column.
calibre
calibre is an e-book manager. It can view, convert and catalog e-books in all of the major e-book formats. It can also talk to e-book reader devices. It can go out to the internet and fetch metadata for your books. It can download newspapers and convert them into e-books for convenient reading. It is cross platform, running on Linux, Windows and OS X.
For more information, see the calibre About page
Screenshots
Usage
See the User Manual
Development
Setting up a development environment for calibre
A tarball of the source code for the current calibre release.