Google Code Blog: Gmail for Mobile HTML5 Series: Reducing Startup Latency: "To a user, the startup latency of an HTML 5 based application is critical. It is their first impression of the application's performance. If it's really slow, they might not even bother to wait for the app to load before navigating away. Even if your application is blazing fast after it loads, the user may never get the chance to experience it.
There are several aspects of an HTML 5 based application that contribute to startup latency:
1. Network time to fetch the application (JavaScript HTML)
2. JavaScript parse time
3. Code execution time to fetch the data and render the home page of your application"
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