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I have slow issue too with an epub have many images, many embeded videos, and file size 265MB, loading time 20s.
Luckily after read a lot of forum posts I solve it by steps:
1. Turn off hardware virtualization in Kaspersky reduce loading time from 20s to
12s
2. In graphic card control , I change Tessellation mode to applications setting, and bang! loading times now 1s
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