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Speed Tracer is a Google Chrome extension that allows you to identify and repair performance issues in your web apps. It visualizes metrics that are taken from low level instrumentation points inside of the browser and analyzes them as your application runs.

Using Speed Tracer you are able to get a better picture of where time is being spent in your application. This includes problems caused by:
· Javascript parsing and execution
· Layout
· CSS style recalculation and selector matching
· DOM Event handling
· Network resource loading
· Timer fires
· XMLHttpRequest callbacks
· Painting