The Three Types of Performance Testing – CSS Wizardry – CSS Architecture, Web Performance Optimisation, and more, by Harry Roberts

I like Harry’s categorization for performance testing:

I try to distill the types of testing that we do into three distinct categories: Proactive, Reactive, and Passive.

I’ve been using “Active” and “Passive” myself and found that it really helps companies better understand why having both synthetic and RUM monitoring in place is important. I really like the way Harry breaks that “Active” category out further based on whether the tests are run proactively or reactively.