Performance & Core Web Vitals

What is a performance and Core Web Vitals review?

A performance and Core Web Vitals review evaluates your website or web app's real-world load speed, interactivity, and visual stability - the metrics Google uses as search ranking signals and the dimensions users notice immediately when a site feels slow.

Core Web Vitals are Google's three primary user experience metrics: Largest Contentful Paint (LCP) measuring load speed, Interaction to Next Paint (INP) measuring responsiveness, and Cumulative Layout Shift (CLS) measuring visual stability.

A performance review combines real-device human testing with technical metric analysis - capturing both the objective scores and the felt experience of using your product on a range of devices and connections.

Why performance directly affects rankings and revenue

Google has used Core Web Vitals as ranking signals since 2021. Pages with poor LCP, high CLS, or slow INP scores are penalized in search rankings regardless of content quality. Performance is now an SEO requirement, not just a UX nicety.

The impact on revenue is well-documented: a 1-second delay in page load reduces conversions by 7%. Amazon found that every 100ms of latency cost 1% of revenue. For e-commerce and SaaS landing pages, performance is directly tied to revenue.

Users on mobile devices and slower connections experience performance failures most acutely. Since Google uses mobile-first indexing, the mobile performance of your pages determines your rankings - even for desktop searches.

Most performance issues are fixable with targeted changes: unoptimized images, render-blocking scripts, missing lazy loading, font loading delays, and layout shifts caused by content loading without reserved space.

How we review performance - and what you get

Human reviewers test your product on real devices across different connection speeds, documenting the felt experience of loading and using your product alongside Core Web Vitals measurements.

Every performance finding is paired with the specific metric it impacts, the element or resource causing the issue, the severity, and the recommended fix. Reviewers evaluate image optimization, script loading order, font display behavior, layout stability, and server response time.

The final report prioritizes findings by impact on Core Web Vitals scores and perceived performance - so your team can focus on the changes that move the needle on both rankings and user experience simultaneously.

• Real-device performance testing across connection speeds
• LCP, INP, and CLS measurement with root-cause identification
• Image, font, and script optimization findings
• Layout shift sources identified with element-level detail
• Mobile and desktop performance gap analysis
• Impact-prioritized fixes for Google rankings and user retention

Ready to get your performance & core web vitals?

Submit your product and real humans will review it, write independent reports, and deliver findings your team can act on immediately.