Convoy emphasizes the importance of load testing as a means to evaluate software performance, reliability, and stability under simulated workloads, particularly focusing on webhook handling. This involves using tools like K6, chosen for its simplicity, to assess critical API endpoints by simulating traffic and monitoring metrics like response times and error rates. The testing approach is goal-oriented, setting specific thresholds to ensure system performance aligns with service standards and does not regress with new code or infrastructure changes. The tests are integrated into a CI workflow using GitHub Actions, ensuring they reflect production environments for accuracy. Results are exported to InfluxDB and visualized with Grafana to facilitate ongoing performance evaluation and optimization, aiming to maintain a system capable of processing millions of concurrent requests efficiently.