Ask HN: Which CSS framework for fast mobile UI for ex-bootstrap dev?

I almost exclusively use Bootstrap 3 before for build my clients websites. Now I'm facing the need to start again for a ecommerce site that will be used mostly on mobile (but not pretending to be a native app).

I wish:

- Fast UI interaction (scrolling, selecting and search) as possible on Android 6+ and iPhone 10+. My customers are mostly on Colombia and can't rely in high-end phones. Android is my main headache.

- To be used by generating most of the html on server side. This is not a PWA.

- If possible, not to hard to build the UI controls for power the frontend and admin backend.

This is what I have research:

- I have tried to use http://quasar-framework.org for other apps. The performance is subpar on mobile (aka: Android), and also we don't aim to mimic a native mobile UI.

- Have look at https://tailwindcss.com and http://tachyons.io/ but is unclear to me how actually good them are

- Also look at so many (light) frameworks, but wish to have somebody else with hands on experience, because the html/css/js landscape is too vast and ever-changing

- Probably use vue, but could switch to any other js framework that could deliver a faster reactions

P.D: Browers stats: http://gs.statcounter.com/browser-market-share/all/colombia