If using patches, try without any.
I removed 3 patches from my Libra 2 and it made a big difference, more responsive and no obvious freezes.
The three patches removes were:
Custom kepub default margins
Force user line spacing in KePubs
Can't remember the third other than it was a kepub specific.
Never did get round to testing but I assumed one of more of the above conflicted with other patches I was using.
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