How to Troubleshoot Slow Checkout in E-Commerce | System Design Interview

If an E-commerce checkout suddenly becomes slow during high traffic, how do you investigate the issue step-by-step? In this video, we break down the exact logical order to isolate and solve performance bottlenecks—a classic System Design and Tech Interview question! Key Investigation Steps Covered: Check System Logs & Error Metrics – Look for immediate exceptions, status code spikes (5xx), or deployment changes. Monitor Database Queries – Identify slow queries, missing indexes, database connection pool saturation, or table locks. Analyze Network & External APIs – Audit payment gateway latencies, third-party services, and API response times. Optimize Server & Application Code – Trace CPU/Memory usage, garbage collection pauses, and unoptimized code paths.