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f2
F2 is a cross-platform command-line tool for batch renaming files and directories quickly and safely. Written in Go!
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250 would be no problem for the Advanced Renamer GUI. On the other hand, it really bogged down loading more than 2000 or so. And my memory was that the Advanced Renamer command-line version choked down quite badly on huge numbers of files. I wish I could remember how long the Bulk Rename Utility command-line operation took. It seemed quite reasonable to me; the critical thing for me was that I was able to process many thousands of renames in one unattended job, without having to break up the job into smaller chunks, with all the manual intervention involved. I didn't try to assign a particular number of cores for the operation. Also you might want to have a look at https://github.com/ayoisaiah/f2 .