[lawn]

I agree. At work we use Windows and all the dev tools are integrated to Emacs (and Emacs alone). And magit is just incredibly slow.

[TeMPOraL]

I had some performance issues with Magit (and git in general) under Windows, but ultimately resolved them. I documented the solutions here: https://news.ycombinator.com/item?id=26736006. Maybe some of it will work for your case.