Sometimes I also have the feeling GitHub is slow. The web interface reactivity is also usually better in Chrome then Firefox. Well, after all that tells us tha

Sometimes I also have the feeling GitHub is slow. The web interface reactivity is also usually better in Chrome then Firefox. Well, after all that tells us that GitHub doesn't do anything magic. If you bother, checkout other services, such as Gitlab. If you can afford, host your own Git server (for instance Gitlab CE). It requires basically no administration (I have done it for ~100 users for 3yrs).