Professor Sloth

Keyword Vitals

Discover how web performance drives your SEO rankings with this free Chrome Extension

  • Automated Scans

    Your most important pages tested every week, automatically.

  • Real-Time Testing

    Test your pages on demand to make sure they are as fast as possible.

  • Instant Recommendations

    Get details and explanations to make your website faster.

Proactive

Find performance issues before they impact users

Lab Performance Testing automatically scans your site’s busiest pages every week, identifying critical issues like large images, slow server response times, and layout shifts. Stay ahead of slowdowns with clear diagnostics for both desktop and mobile.

Find performance issues before they impact users
  • Automatic weekly scans

    Automatic weekly scans

    No manual effort required—your top pages are tested automatically.

  • Core Web Vitals

    Core Web Vitals

    Target SEO-critical metrics like LCP and CLS.

  • Mobile and desktop insights

    Mobile and desktop insights

    Get tailored results for both device types.

Request Metrics showed us all the unused marketing pixels and vendor rubbish that was slowing down our users.
Anton Ball
Anton Ball
Full Stack Team Lead, Doist
Actionable

Actionable Recommendations

Understand exactly what's slowing you down, and how to fix it.

Actionable Recommendations
  • Detailed diagnostics

    Detailed diagnostics

    Pinpoint the exact cause of slow load times or visual instability.

  • Step-by-Step fixes

    Step-by-Step fixes

    Clear, actionable steps make optimization easy.

  • Real-time validation

    Real-time validation

    Run tests on demand to ensure every fix improves performance.

Request Metrics feels like I have some unfair advantage on Google now!
Chris Hall
Chris Hall
Founder, XABCD Trading
Integrated

Seamless integration with Real User Monitoring

Combine Lab Performance Testing with Real User Monitoring for unparalleled insights. Lab tests catch issues in a controlled environment, while real-user data validates their real-world impact, all in one unified dashboard.

Seamless integration with Real User Monitoring
  • Metric Comparisons

    Metric Comparisons

    See how lab scores align with real-user experiences.

  • Unified Dashboard

    Unified Dashboard

    All your data in one place—no need for multiple tools.

  • Full Visibility

    Full Visibility

    Understand both potential issues and their actual user impact.