Best Practices Performance Testing Traffic Wireless 
Dynatrace
JUNE 27, 2022
RUM, however, has some limitations, including the following: RUM requires traffic to be useful. Because pre-production environments are used for testing before an application is released to end users, teams have no access to real-user data. RUM works best only when people actively visit the application, website, or services.
Smashing Magazine
SEPTEMBER 6, 2021
You would, however, be hard-pressed even today to find a good article that details the nuanced best practices. This is because, as I stated in the introduction to part 1 , much of the early HTTP/2 content was overly optimistic about how well it would work in practice, and some of it, quite frankly, had major mistakes and bad advice.
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