Ask HN: What back end can provide noticeable performance improvement over Rails?

Hi, pretty much the subj.

What backend framework / technology, if any would provide a noticeable performance in loading / response times over latest Rails?

Provided that:

1) Rails project is fairly optimized (Pagespeed 90+ etc.).

2) No particular requirements, such as an extreme concurrency (not trying to replicate Discord etc.) or extra-large downloads or video streaming / video chat / deep learning, just a very fast website with a database and a backend that serves it.