Edge caching

[lfborjas]

Probably want something like this: https://devcenter.heroku.com/articles/edge -- $5 a month, but should keep things snappy.

[lfborjas]

All of these features are paid. Consider adding a sponsorship option? https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/displaying-a-sponsor-button-in-your-repository

[lfborjas]

In fact, apart from static assets (which are very tiny right now,) edge caching would probably be as useful as simple browser caching for the current set of features: how often are people looking at their own chart in different devices? Maybe they're linking it from their websites? I believe client-side simple caching (as per #23 ) will get us a long way, and if there's enough traffic to warrant edge caching, maybe Fastly or Google Cloud CDN are better options?