If you are looking to scale your website or application in a significant way, load testing is an absolute necessity for you.
Load testing is a way to ensure your website or app doesn’t crash under heavy loads. When load testing, one of the basic things you need to do is scale the number of virtual users you are testing. Depending on your business needs, you might need to scale to huge numbers, maybe even to 1,000,000 users.
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https://dzone.com/articles/5-tips-when-scaling-your-website-or-app-to-1000000?fromrel=true
