Testing on Fast Wi-Fi Is Not a Performance Test

Testing on Fast Wi-Fi Is Not a Performance Test Tags: #react #performance #webdev #javascript Most performance testing happens on a MacBook Pro, over a fast home or office connection, with a warm browser cache. Then you deploy and wonder why the numbers are different in production. The gap isn't mysterious. You were never testing what your users experience. What your local setup hides from you Three things consistently make local testing optimistic: Your CPU is fast. A React component tree that