A perfect Lighthouse score of 100 in all categories (Performance, Accessibility, Best Practices, SEO, and PWA) is quite rare.
Estimated Percentage of Websites with a Perfect 100 in All Categories
- Based on various industry reports and audits, it’s estimated that well under 1% of websites achieve a perfect score across all categories.
- Performance is typically the hardest to achieve, with most sites struggling to hit 100 due to JavaScript execution, large assets, or render-blocking issues.
- Accessibility, Best Practices, and SEO are more attainable but still require active effort.
- Progressive Web App (PWA) compliance is another challenging category that many sites don’t fully meet.
Why It’s So Rare
- Performance Challenges – Third-party scripts (e.g., analytics, ads), large images, or inefficient coding can impact performance.
- Accessibility Gaps – Many sites miss small accessibility issues like contrast ratios or missing ARIA attributes.
- PWA Criteria – Many sites don’t implement service workers or manifest files, which are required for a perfect PWA score.
While static sites or well-optimized, lightweight pages (like simple blogs or landing pages) can achieve perfect scores, most dynamic or content-heavy websites don’t.