WordPress page speed

Hi everyone, I’m currently working on a WordPress-based informational website and I want to improve both speed and user experience. I’ve optimized images and used caching plugins like WP Rocket, but the site still scores low on Core Web Vitals (especially CLS and LCP).

From your experience, what’s the best approach to fix layout shifts and improve page loading speed without compromising design elements? Do you recommend switching themes, using a headless approach, or focusing more on server-side optimizations?