Consider switching from a server-side SWR implementation to Nginx caching

[muffinresearch]

Once the Next.js port has landed, since Nginx sits on top of the Next.js app on Heroku, it might be better to use that instead of a custom server-side implementation of SWR.

Nginx is able to handle serving stale content whilst refreshing the data in the background: See https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_use_stale and http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_background_update