Find which tag is hurting your Google ranking
TagSense measures LCP, INP, and CLS in real user sessions and attributes slowdowns to specific vendors. The Tag Performance Budget shows you which tag adds how many milliseconds on LCP-critical pages - so you know exactly what to fix.
What Web Vitals monitoring covers
LCP, INP, CLS monitoring
p75 Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift - measured in real user sessions, not lab conditions.
Tag performance budget
Every vendor grouped by how much they add to LCP on your most important pages. Slow vendors highlighted with millisecond impact.
FCP and TTFB
First Contentful Paint and Time to First Byte round out the Core Web Vitals picture and help isolate server vs tag issues.
Device class breakdown
Web Vitals split by low-end, mid-range, and high-end devices. Identify issues that only affect mobile users on slower hardware.
Long tasks monitoring
Main thread blocking tasks counted and attributed. Know when a tag monopolises the browser and blocks user interaction.
LCP-critical page focus
Tags are segmented by whether they fire on LCP-critical pages (homepage, product pages) vs non-critical pages.
Real story: LCP recovered from 3.8s to 2.0s in one fix
A site's Google Search Console shows LCP deteriorating from 2.1s to 3.8s over 3 months - a Poor score costing Google ranking positions. TagSense Web Vitals shows the tag performance budget: a new VWO A/B testing tag added 620ms on the homepage.
The developer moves the tag to fire on scroll instead of page load. LCP drops back to 2.0s - a Good score. Google ranking recovers within 28 days of the fix. Without TagSense, the team would have needed weeks of profiling to identify the culprit.
Stop guessing which tag is slowing your site
Web Vitals monitoring is included in Starter and Pro plans. Start with a free account to see your health score.