I am not sure if this is helpful or not. I have a Clara BW. I do not have any issues opening any of my files either epub or kepub. kepub files open immediately and epub files open slightly slower (maybe 1-2 seconds). Opening any file is faster on my Clara BW compared to my older Libra 2. It sounds like you either have an issue with your source files or your device. The behaviour you describe is not normal imo.
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