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Troubleshoot Slow Web App

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Your question is Troubleshoot Slow Web App. Take a moment with it on the right.

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Problem

Trouble-shoot a slow web application where one client is complaining that sometimes it is slow.

Asked in the Technical Phone Screen stage. Mini-case question focused on web application performance troubleshooting. Assume the client uses the same web app as other customers, but only this client reports intermittent slowdowns. Your goal is to identify what metrics you would inspect first and how you would narrow the issue down.