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Tracking JavaScript execution during startup

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   For a JavaScript-heavy web application, tracking down the startup process is not always fun. Worse, this often can’t even be automated so that it can be used to prevent future performance regression. Let’s be honest, how many of us have systematic and reliable startup time checks in the continuous integration system?
   First, we need a test page, which could be very simple. The most important part is to load the necessary libraries. I took an example HTML file from jQuery Mobile demo and simplified it. It loads both jQuery and jQuery Mobile, nothing else. With some filler text, the page looks like the following screen capture:
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