Periods of high customer activity, such as Black Friday and major sales, can strain software and infrastructure systems, leading companies like Just Eat Takeaway.com to utilize Grafana Cloud k6 for performance testing to ensure system reliability under load. This testing framework helps organizations prepare for peak demands by prioritizing critical user journeys and employing proactive monitoring to detect performance regressions early. Grafana Cloud k6 provides flexible testing options, including synthetic monitoring and customizable dashboards, allowing for continuous feedback on application performance and the ability to identify patterns in testing data. By testing early and often, companies can better manage peak loads and optimize user experiences, as highlighted by Grafana Labs' recognition as a leader in the 2025 GigaOm Radar Report for Cloud Performance Testing.