This is something that is very hard to achieve purely client side, since it is data and cpu intensive.
About the visualization: graphs are cool, but they should really offer a useful perspective, and ...
Wot client side is expensive, but not prohibitive. You only need to download your follow's follow events to get decent coverage. As nostr grows and second order connections become more important though, a server side component will be more necessary to get good coverage
1🤙1