Where the time and space go
Say an app is slow to open a report. A profiler records what the program does while the report opens, showing where it spends time or memory. A CPU profile tracks processing time; a memory profile shows which parts use working space. A flame graph is a chart showing which chains of steps take the most processing time.
Check the result in real use
Profiling can reveal a slow step nobody expected. Teams can change it, then measure again. Profiling itself may slow the app, and a test laptop may behave differently from a customer’s device. Teams use realistic tasks, protect sensitive data, and check what users experience.