Joan Leon is a web performance consultant and co-founder of PerfReviews , helping businesses of all sizes optimize the speed and efficiency of their websites. He is also a Google Developer Expert in Web Performance and a Cloudinary Ambassador. I believe it’s a very powerful feature—not just for debugging Web Performance, as we’ll see today—so if you didn’t know about it, I invite you to explore its functionality and possibilities. For this example, I discussed using Overrides with Stoyan, based on the Web Performance Calendar site, to test hypotheses for performance improvements. Validating or Invalidating Hypotheses to Improve UXYes, I switched Web Performance to User Experience, since improving web or app performance has a direct impact on UX.