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The website appears to be related to performance measurement and optimization. It mentions functions like noop (no operation), performance window, performancemark, performancemeasure, and performancetiming. There are also references to the timing of events using initial timestamps and the date.now function. The site seems to include various libraries and releases related to performance optimization. Additionally, there are mentions of error handling and image loading with error catching functionality. The code includes polyfills for older browsers and has a section about credentials for same-origin requests. There are some cubic-bezier values mentioned as well. Overall, the website seems focused on providing tools and information for measuring and improving performance in web development tasks.