Find what is slowing visible load and main-thread work
Analyze Largest Contentful Paint and Total Blocking Time with resource, image, CSS, font, JavaScript, main-thread, and rendering pipeline diagnostics.
Your LCP & TBT report will appear here
The analyzer focuses only on visible load speed and main-thread blocking work, with practical fixes for developers and agencies.
Previous reports
No saved LCP/TBT reports yet.
What the analyzer checks
LCP element
Find the largest visible element and what delays it
Resource loading
Waterfall, render blockers, cache, CDN and preload opportunities
TBT blockers
Long tasks, JS execution, hydration, parsing and third-party scripts
PDF reports
Export and track Firebase history over time
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