Which tag is killing your LCP score? TagSense tells you exactly.
TagSense gives developers the data they need to make tag performance decisions: per-vendor LCP impact, CSP violation logs, payment page security audits, and duplicate tag detection - all from BigQuery, all in real time.
Tag performance budget
Per-vendor average duration and p75 duration on LCP-critical pages. Slow vendors highlighted with exact millisecond impact. Know which tag to defer or remove before the performance review.
Core Web Vitals tracking
Real-user LCP, INP, CLS, FCP, TTFB - p75 values measured from actual browser sessions, not synthetic lab tests. Device class and browser breakdown included.
CSP violation log
Every Content Security Policy violation logged: blocked URI, violated directive, disposition (enforce vs report-only), and occurrence count. Debug your CSP without browser developer tools.
Payment page domain audit
Every domain called from /checkout listed and monitored. Unknown domains flagged Critical. Tag execution timeline with millisecond precision for PCI DSS compliance reviews.
Long tasks monitoring
Main thread blocking tasks counted and attributed. When a third-party tag monopolises the main thread, TagSense shows it - with duration and which pages are affected.
Duplicate tag detection
Tags firing more than once per page load detected automatically. Catch double-firing GTM triggers before they inflate conversion counts or hurt performance.
Data your team actually needs for tag performance decisions
TagSense stores all tag event data in BigQuery - queryable for custom reports. Pro plan includes tag performance budget and payment page security audit.