Quote:
Originally Posted by Starson17
Qt is a cross-platform application and UI framework. It's what allows Calibre to run on three supported OSs with a consistent interface.
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Ok, here was some confusion. The "real" Webkit at webkit.org is a OSX only engine with very good performance. As Calibre is multi-platform its build on a Webkit spin-off based on Qt. Its not surprising that this may lead to performance issues but as said this Qt Webkit is so slow on OSX that its actually useless.
Thus I will better use an external ePub viewer.