There is no need at all to polish to convert ePub 2 eBooks to ePub 3. It does absolutely nothing useful unless you need to add ePub 3 specific features. Just let the ePub 2 eBooks stay as ePub 2 and the ePub 3 stay as ePub 3.
One thing KOReader does is cache the eBooks. You can try opening them again after they've once been opened to see if they get any faster. I don't know what Plato does.
Last edited by JSWolf; 03-14-2022 at 02:34 PM.
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