Okay, I just pushed using the stored zip crc32, the stored zip uncompressed size, and the file name ( with all paths removed) as the key to store and retrieve zip modification times.
Please give this a try with your multiple test runs. Importing times should return to what they were previously (ie. be faster). Files can be moved around but not renamed and still keep their modification dates on Export. And Export times should be faster since crc32 is faster than an sha256.
Hopefully this version is better and will not need a Preference change.
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