Developers and bloggers are still falling for outdated web performance beliefs despite changes in Google's expectations and evolving Core Web Vitals.
The biggest myths hurting website speed, UX, and SEO include obsessing over scores and not optimizing for what users actually experience.
To improve website performance, it is recommended to check field data, simulate slow devices, lazy load images, use a CDN, and optimize images with WebP and AVIF formats.
Using tools like Chrome DevTools, CrUX, and frameworks built for performance, along with aggressive code-splitting and hydration, can enhance website speed and user experience in 2025.