The Script Performance section provides a history of script executions and shows information about the history of the scripts execution. This section can be found at Power Apps Config → Runtime → Script Performance.
Information about each script includes:
Exec - Number of times script was executed
Min - Fastest time script was ran and successfully completed
Max - Fastest time script was ran and successfully completed
Avg - Average time script was ran and successfully completed
Errors - The number or times a script raised an error in the logs
Note: A dramatic difference between the min and max script execution time can often be seen because of logic within the script. Sometimes the script may include logic that states the script should continue to run for specific scenarios. Therefore, the best number to use to understand the cost to system performance for a script would be the average execution time.