WebPageTest Staff

Tim Kadlec

Tim Kadlec is the Director of Engineering for WebPageTest, a web performance consultant, and trainer focused on building a web everyone can use. He is the author of High Performance Images (O'Reilly, 2016) and Implementing Responsive Design: Building sites for an anywhere, everywhere web (New Riders, 2012). He writes about all things web at timkadlec.com.

All posts by Tim Kadlec

  1. - 4 min. Read

    Better Performance Testing Through the Power of Defaults

    Tim Kadlec
  2. - 4 min. Read

    WebPageTest's Guiding Principles

    Tim Kadlec
  3. - 4 min. Read

    September 2022 WebPageTest Roundup

    Tim Kadlec
  4. - 5 min. Read

    No More EV Certificate Overhead in Chrome 106

    Tim Kadlec
  5. - 3 min. Read

    Improving Paint Metrics by Removing Unused Preloads

    Tim Kadlec
  6. - 3 min. Read

    Introducing the New WebPageTest Recorder Chrome Extension

    Tim Kadlec
  7. - 5 min. Read

    Introducing Opportunities & Experiments: Taking the Guesswork out of Performance

    Tim Kadlec
  8. - 4 min. Read

    January WebPageTest Roundup

    Tim Kadlec
  9. - 3 min. Read

    Unveiling the new WebPageTest UI

    Tim Kadlec
  10. - 3 min. Read

    September WebPageTest Roundup

    Tim Kadlec
  11. - 5 min. Read

    Full Throttle: Comparing packet-level and DevTools throttling

    Tim Kadlec
  12. - 3 min. Read

    August WebPageTest Roundup

    Tim Kadlec
  13. - 2 min. Read

    Announcing Official Support for the WebPageTest API Wrapper for NodeJS

    Tim Kadlec
  14. - 3 min. Read

    July WebPageTest Roundup

    Tim Kadlec
  15. - 4 min. Read

    New Render Blocking Indicator in Chrome and WebPageTest

    Tim Kadlec
  16. - 2 min. Read

    June WebPageTest Roundup

    Tim Kadlec
  17. - 9 min. Read

    Benchmarking JavaScript Memory Usage

    Tim Kadlec
  18. - 3 min. Read

    May WebPageTest Roundup

    Tim Kadlec
  19. - 6 min. Read

    Why First Contentful Paint Doesn't Work As a Cross-Browser Metric

    Tim Kadlec
  20. - 3 min. Read

    Extending WebPageTest with Custom Metrics

    Tim Kadlec
  21. - 9 min. Read

    Diving Into the New Cumulative Layout Shift

    Tim Kadlec
  22. - 6 min. Read

    Automatic WebPageTest Results for Every Docs Deploy

    Tim Kadlec
  23. - 4 min. Read

    With M1 Mac Minis, The Future is Bright for Mobile Device Testing

    Tim Kadlec