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Rahul Rai explains how to set up cost-effective load tests with Locust. Locust tests can be distributed over multiple machines to simulate millions of users simultaneously. Using VS Code and Docker, you can use VS Code for development without installing dev dependencies on your system. The guidance in this article is limited to executing low to medium level tests (less than 10,000 requests per second) For high-scale tests, you should contact Heroku support first to ensure your systems are pre-warmed and will scale appropriately, or use Private Spaces to host your testbed.