Wondeding if Acha will be open sourced :) Only because their platform description sounds tempting. They say no AJAX once it's loaded (isomorphic) but I don't see that on the site, wondering if that's just not live.
It will be open sourced.
We download whole database at beginning and put it to datascript (https://github.com/tonsky/datascript). We don't make any additional requests to render user/repo profile.
