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Thanks man! Didn't know about that?

Does sites like Github and Gitlab also use some kind of wrapper over Git or they have their own custom implementations?

I remember reading an article about this. There was some performance problem with Git, which GitHub fixed internally, then contributed the fix back to Git itself. From this I guess GitHub uses Git, or maybe libgit for their software. GitLab has an open source version, so you can take a look and see for yourself. Also, this might be a good question to ask separately.