1. flycat use Next.js framework and host it on vercel. almost everything is client rendering, excecpt for two things: (1. we render article title in server-side so when you share url link of long-form, other people can see the url's title there is no way to do this on client-side. (2. long-form article RSS api, it is also provided in nextjs server-side 2. as for the cookies/platform.twiiter, I once asked a frontend to do twitter url embed rendering I guess it is related to that 3. of course not. I don't even have time to store events on localStorage to help improve the performance. and btw, it is all open-source so feel free to check the code https://github.com/digi-monkey/flycat-web