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I've made some improvements to your fork of the Vss2Git project. Your changes helped me a lot already to do the conversion, and I think these changes are good improvement.
What I did is basically remove the dependency is msysGit. Instead, I use the NGit library (my own fork of this because there were a few issues with it). This means that it doesn't start new processes anymore.
I've tested this on a project of 6000 files with 5000 commits and the whole conversion now runs in roughly 6 minutes.