Do not expect much speedups. In epubs with more normal number of files it will be unchanged but fast as it is bound by OS file creation times. In epubs with huge numbers of files, expect the worst-case time to grow linearly with the number of files and not geometrically as it did before. So with about 1000 files it should be under the 2 seconds you measured but barely. At 1500 files it should be much better in the worst case.
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