What are the criteria for entering and exiting in testing performance?

You can begin testing application performance during the designs. After evaluating these tests, you can collect and analyze the results for performance to be improved. The process of performance tuning will be done throughout the life cycle of the application development. Performance tuning is done based on factors like application release time and application stability user requirement, scalability under load, reliability, performance tolerance and stress tolerance criteria. The end criteria in some projects are defined based on the performance of the client, defined for each application section. When a product gets to the level expected then this is considered as performance testing end criteria.