Extremely long subtree split duration

Windows has always been a bit slower with subtree split, but now we encountered an extreme difference.

The test is on the opensource repository of bitnami charts:

git clone https://github.com/bitnami/charts.git cd charts git subtree split -P bitnami/minio -b split

On live Ubuntu 24.04 booted from usb stick, it took about one and a half minutes.

On Windows 11 installed on internal nvme, it took almost 4 hours.

Yes, it sounds crazy, but it really took three hours and 53 minutes on the same hardware.

Main difference (except OS) is git version. On Ubuntu is latest installed via apt 2.43.0, on Windows is 2.47.0.windows.2.

I have tried several different OS in docker, virtualbox, different HW, different git versions..

Long story short, it looks like since version 2.44.0-rc0, probably after merging 'zf/subtree-split-fix', subtree split is much much slower.

And practically unusable on Windows.

Can this be fixed?

Thanks, Peter "Cache" Kassak