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Brilliant piece of Go code, congrats! Out of curiosity - have you tried benchmarking this against Golang's libgit2 bindings running from ramdisk? For a small side project where I needed `git blame` functionality I got 10-20x speed boost from doing just that.

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diff --git a/README.md b/README.md
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-# go-git [![GoDoc](https://godoc.org/gopkg.in/src-d/go-git.v2?status.svg)](https://godoc.org/gopkg.in/src-d/go-git.v2) [![Build Status](https://travis-ci.org/src-d/go-git.svg)](https://travis-ci.org/src-d/go-git) [![codecov.io](https://codecov.io/github/src-d/go-git/coverage.svg)](https://codecov.io/github/src-d/go-git)
+# go-git [![GoDoc](https://godoc.org/gopkg.in/src-d/go-git.v2?status.svg)](https://godoc.org/gopkg.in/src-d/go-git.v2) [![Build Status](https://travis-ci.org/src-d/go-git.svg)](https://travis-ci.org/src-d/go-git) [![codecov.io](https://codecov.io/github/src-d/go-git/coverage.svg)](https://codecov.io/github/src-d/go-git) [![codebeat badge](https://codebeat.co/badges/b6cb2f73-9e54-483d-89f9-4b95a911f40c)](https://codebeat.co/projects/github-com-src-d-go-git)