Performance Testing in the Cloud with Postman: What We Built

Postman’s cloud performance testing enables teams to run load tests directly from their existing Postman Collections, preserving requests, authentication, environment variables, and pm.test assertions so functional validation continues at every level of load. Users can configure virtual user counts, durations, and ramp profiles through the Collection Runner without provisioning infrastructure, while Postman deploys and manages cloud workers that stream real-time response-time, throughput, and error-rate metrics to the client. The engineering design addresses distributed load-testing challenges through synchronized worker starts using shared future timestamps, exact splitting of load profiles across workers, continuous metric persistence to protect data if workers fail, and test completion logic that captures responses arriving after the configured load period. This approach aims to unify functional and performance testing in one reusable artifact while making large-scale API testing accessible without relying on local hardware or network capacity.

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