- Adding caching static assets/images/etc (Not sure how this is done on Heroku but fairly straight forward with Nginx or Apache). Currently, your assets are taking a full 6 seconds to serve.

- Possibly serving your static homepage etc from one server/Heroku instance and your functional app from another so you don't put the stress of traffic on a homepage on the app server as well.

Edit: Adding this link to be a bit more helpful. https://devcenter.heroku.com/articles/http-caching-ruby-rail...