I found the best responsive theme for Wordpress: Mediavine Trellis review
Mediavine Rolls Out WordPress Theme Framework to the Open Web Empowering Independent Publishers to Pass Google's Core Web Vitals
Trellis: Built For Speed. For Content Creators. For the Future. - Mediavine
Trellis: A Theme Framework For Passing Core Web Vitals | InMotion Hosting
Mediavine on X: "New year, new theme! Trellis is our award-winning WordPress framework designed to increase your site speed, helping you pass Core Web Vitals and make more money, and it's on