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Based on the provided text, it appears to be a technical website discussing JavaScript functions and performance optimization. It mentions terms like "performance window," "performancemeasure," and "performancenow," indicating that the site discusses ways to improve code efficiency. The text also includes references to different libraries and browser compatibility issues, suggesting that it could be a resource for web developers seeking information on compatibility testing and polyfills. However, without further context, it is difficult to determine the exact purpose or specific topic of the website.