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I wrapped my removetree call to include a hassyspath check, and use shutil.rmtree if it it does.
I think I can add this to base.py after the lock here: https://github.com/PyFilesystem/pyfilesystem2/blob/fs/base.py#L1223
The speed improvement for the large-ish directory I tested on, was 4.5s down to ~3s. I'll submit a PR in case it's useful.