I've found the WebKit renderer used with KEPUB to be a bit faster and more stable than the EPUB renderer, which is based on ADE. When reading long novels, I've had worse performance (very long page turns between chapters) and a couple freezes when using EPUB. The ability to hold the page turn button and rapidly flip through pages is also very handy with KEPUB, so I convert all my EPUBs before loading them on my Libra 2.
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