How can I test my Django & React app with massive users efficiently?

I’m working on a Django backend and a React frontend, and I need to test my app with a large number of users.

I have used Cypress for UI testing, but it takes too much time to complete the tests I need. My goal is to test two different scenarios:

1. First scenario (8,840 users)

   • Register a user

   • Modify user details

   • Create a contribution

2. Second scenario (~300,000 users)

   Perform the same process as the first scenario but on a much larger scale

I’m looking for a faster and more efficient way to execute these tests.