Ask HN: Should I store my js/css bundles on localStorage for better page load?

Check out service workers, they are designed to solve this problem,

https://developer.mozilla.org/en-US/docs/Web/API/Service_Wor...

In addition to caching JS/CSS, you can also cache your main document so your app can work offline.

Are you familiar with HTTP cache headers? Better to focus on your application and let the browser think about that stuff, if possible.