Based on my timings comparing Sigil 1.8.0 official using Qt5.12.9 versus Sigil master using Qt 6.2.2 with the zip modification date storage, their appears to be little to no noticeable change in loading times of a large epub with many files. So the sha256 hashing is dwarfed by the zip decompression and file writing times. So their is probably no need for a user preference setting. But more testing with even bigger files would be helpful.
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