How can I measure Flex/Java app response and rendering time?

We have Flex/Java app with a typical scenario:

1. Clicking the button
2. Preparing request
3. Sending request to the backend
4. Receiving a response from the backend
5. Rendering the respons开发者_JAVA百科e

How can I measure time from the start of step 1 to end of step 5?

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The most common approach would be to use the getTimer() method. Call it when you click the button; and call it again when you finish rendering the response. Compare the two values to get the amount of time that has passed.