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Monitor Core Web Vitals (LCP, FID, CLS, INP) with real user data. Identify slow pages, get optimization recommendations, and track performance improvements over time. Free tier.
Everything you need to get started — no configuration, no credit card, no learning curve.
Core Web Vitals monitoring including LCP, FID, CLS, and INP with real user data
Real User Monitoring (RUM) data collection from actual visitor browsers
Page-level performance breakdown showing slowest pages and resources
Optimization recommendations with estimated impact on Core Web Vitals scores
Performance regression alerts triggered by deployments or traffic spikes
Lighthouse score tracking over time with automated weekly audits
Device and connection type segmentation (mobile vs. desktop, 3G vs. 4G vs. WiFi)
Integration with Google Search Console for correlating performance with SEO rankings
Get results in three simple steps — no account required.
Add a single script tag to your website. It collects real user performance data with under 1KB of overhead and no impact on page load.
View Core Web Vitals dashboards, identify your slowest pages, and see how performance varies across devices and connection types.
Follow prioritized recommendations, deploy fixes, and track improvement trends over time. Get alerts when regressions occur.
Teams and individuals across industries rely on PerfProfiler to solve real problems every day.
E-commerce sites optimizing page speed for higher conversion rates
SaaS products improving user experience and reducing bounce rates
Marketing teams monitoring landing page performance for ad campaigns
SEO teams tracking Core Web Vitals as a Google ranking factor
Engineering teams catching performance regressions after deployments
Real User Monitoring (RUM) collects data from actual visitors using real devices and connections, reflecting true user experience. Synthetic monitoring runs lab tests from controlled environments. PerfProfiler uses RUM for accurate field data and complements it with Lighthouse audits.
No. The script is under 1KB gzipped and loads asynchronously. It has zero impact on your page's render time, Core Web Vitals scores, or user experience.
PerfProfiler tracks all current Core Web Vitals: Largest Contentful Paint (LCP), Interaction to Next Paint (INP), Cumulative Layout Shift (CLS), and the legacy First Input Delay (FID) for backward compatibility.
Yes. You can define thresholds for each metric (e.g., LCP under 2.5 seconds) and receive alerts when any page exceeds the budget.
PageSpeed Insights provides a one-time snapshot. PerfProfiler provides continuous monitoring with real user data, historical trends, regression alerts, and per-page breakdowns — giving you actionable data, not just a score.
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Get started in seconds. No credit card, no signup, no commitment.