Core Web Vitals
Track Google's critical user-centric performance metrics to ensure your site meets modern standards.
Performance monitoring is essential for delivering a smooth, responsive user experience. Mtrix provides comprehensive tools to measure, analyze, and optimize your website's performance.
Largest Contentful Paint (LCP)
Measure perceived loading performance:
Definition: Time when the largest content element becomes visible
Target: 2.5 seconds or less
Impact: Affects user perception of page readiness
Common Issues: Slow server response, render-blocking resources, slow resource load times
Tracking: Automatically measured for all page loads
Cumulative Layout Shift (CLS)
Measure visual stability:
Definition: Sum of all unexpected layout shifts during page lifecycle
Target: 0.1 or less
Impact: Affects user frustration when page elements move unexpectedly
Common Issues: Images without dimensions, dynamically injected content, web fonts
Tracking: Measured throughout the page lifecycle
First Input Delay (FID)
Measure interactivity:
Definition: Time from first user interaction to browser's response
Target: 100ms or less
Impact: Affects perception of site responsiveness
Common Issues: Heavy JavaScript execution, long tasks, third-party scripts
Tracking: Measured on first interaction (click, tap, key press)
FID Analysis Tools:
Interaction Map: See where first interactions typically occur
JavaScript Execution: View JavaScript activity during input delay
Long Task Identification: Find code execution that blocks the main thread
Third-party Impact: Measure how third-party code affects interactivity
Additional Core Metrics
Beyond the three Core Web Vitals, Mtrix tracks other critical performance metrics:
Time to First Byte (TTFB): Measures server response time
First Contentful Paint (FCP): When first content appears
Time to Interactive (TTI): When the page becomes fully interactive
Total Blocking Time (TBT): Sum of "blocking" time between FCP and TTI
Speed Index: How quickly content is visually displayed
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