Web Application Performance Debugging

Q: Web Application Performance Debugging

This question evaluates a product manager's ability to diagnose intermittent web application slowness by exercising systems thinking, telemetry interpretation, hypothesis-driven root-cause reasoning, and cross-team prioritization, and it belongs to the Product / Decision Making domain.

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Product / Decision Making questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master product / decision making interviews.

Question

Troubleshooting Intermittent Slowness in a Web Application

Context

A client reports that a web application is intermittently very slow when generating reports or performing searches. No code has changed in the last five months. Assume a typical multi-tier architecture: browser → CDN/load balancer → application service(s) → database and search cluster, plus caches and background jobs.

Task

Explain your step-by-step troubleshooting approach. Include how you would:

Verify whether the issue affects a single user or multiple users.
Gather and analyze performance metrics (e.g., server logs, database queries, network latency).
Form hypotheses, run experiments, and prioritize fixes.

Web Application Performance Debugging

Troubleshooting Intermittent Slowness in a Web Application

Context

Task

Solution

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