Asynchronous render, but faster, and without XHR/AJAX/Turbo

I've been using a simple trick on updown.io since May 2015 to make pages feel faster without doing much work. And I extracted it as a gem so you can too. It's called render-later and I thought it deserved a quick write-up (better late than never). The problem You know that annoying moment when you're building a dashboard and there's one metric that takes 200ms to compute? Maybe it's a database…