Core Web Vitals – page speed, SEO and sales in 2026
LCP, INP, CLS – three metrics that determine your Google ranking and customer satisfaction. Learn how to improve page speed and boost conversion.
Since 2021, Google officially uses Core Web Vitals in its ranking algorithm. In 2026, these metrics matter more than ever, especially after updates increasing the weight of INP and CLS.
Understanding LCP, INP and CLS 📊
LCP (Largest Contentful Paint) measures loading speed – target under 2.5 seconds. INP (Interaction to Next Paint) measures responsiveness – target under 200ms. CLS (Cumulative Layout Shift) measures visual stability – target under 0.1.
💡 Pro tip
Start with PageSpeed Insights. Paste your URL, check the mobile score, and look at the "Opportunities" section. Many fixes (image compression, enabling cache, removing unused CSS) can be implemented in a single day with immediate impact.
Improving these metrics involves image optimization (WebP, AVIF), CSS/JS minification, efficient hosting with CDN, and removing render-blocking resources. Each 0.5s delay can cost you 7-10% in conversions.
Need a performance audit? Check web development services or contact me.
Frequently Asked Questions
- Does page speed actually affect Google rankings?
- Yes. Core Web Vitals have been an official Google ranking signal since 2021. Faster pages rank higher and convert better.
Michał Grycz
Software engineer and founder of MGSupport. Designs and builds high-performance web systems, e-commerce, and business automations.