Profiling is the process of measuring an application or system by running an analysis tool called a profiler. Profiling tools can focus on many aspects: functions call times and count, memory usage, cpu load, and resource usage.

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You really don't know what needs to be optimized until you measure performance.

Profiling your React components may be the most important thing you can do to improve performance. Learn how to do this using the browser's User Timing API.