1) Thank you!
2) I wasn't aware of Qiita, but it looks quite similar. We'd love to have you cross-post and/or translate any articles you've written :)
3) While I don't think another kind of platform is on the immediate roadmap, I do think speed/performance will always be a central priority for us. Not just because it's awesome, but because it's a good constraint to ensure the site is performant and consistent for everyone, not just those on a fast connection.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.