Calibre Perfomance on Mac OSX

[haegar333]

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.

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.

[Starson17]

Originally Posted by haegar333

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.

Correct. OTOH, I'm sort of surprised that QT is too slow for EPUB viewing on OSX, but acceptable for other aspects of Calibre. The entire interface of Calibre is QT based. I'm not sure why poor performance only shows up on EPUBs for OSX. Regardless, I also have other formats set to open with the viewer I find to be fastest or most useful. PDFs are notoriously bad in the Calibre viewer, but I also use custom viewers for .txt and a few other formats.