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Based on the provided text, it is difficult to determine the exact purpose or subject matter of the website. The text appears to be a part of JavaScript code, specifically related to function definitions and variable assignments. It seems likely that the website is related to web performance optimization since terms like "window.performance" and "performancenow" are mentioned. The code may be implementing various functions and measures to improve the performance of web pages. However, without more context or additional information from the website's content, it is not possible to provide a precise summary of what the site is about.