Read an article below from washingtonpost.com:
This evening at its Campire One event, Google showcased a number of new technologies coming to Google Web Toolkit (you can see my live blog of the event here). The big announcements include the release of a new Speed Tracer tool to help developers speed up their web apps; a code splitting tool that enables developers to deploy apps as incremental downloads; and UiBinder, a UI framework that allows developers to seperate the 'logic' presentation of their apps from the presentation portion.
Speed Tracer is a new extension for Google Chrome that is meant to help developers streamline their web applications. In particular, the tool is built to help optimize AJAXy applications. Obviously there are other tools for speed optimization, but many of these have to do with load time. Speed Tracer is meant to track performance over an extended period of time, as users tap into an app's various functions. Google's Andrew Bowers explains that Speed Tracer can track performance bottlenecks in ways that were not previously possible, because it taps into APIs that were built into Webkit for that very purpose (APIs other browser engines don't offer).
The tool will allow developers to isolate exactly which functions in their app are taking a long time to perform, allowing them to monitor performance in real time. It will suggest that developers take a look at certain problem functions (namely actions that take over 100ms, which is when users begin to notice a lag time).
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