I've not used kepub for over a year. Maybe two. My H2O original and now Libra were fine on page turns with "refresh on every page". The highlighting was much slower on the the Original H2O vs PW3 but speeded up on each FW. On the 4.19.x just before the first 4.20.x it is fine on the Libra.
I'll maybe update the libra on Thursday. The H2O original has the prior FW to this.
The kepubs don't render the same as the same book in epub2 on Kobo or on other readers. Though it varies according to how the css is done. I expect an ordinary ebook to look the same on Kindle PW3, Nook, Kobo, apps etc.
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