Abstract: A method and system are provided for implementing performance monitoring of an application on a mobile device. An instrumentation tool is provided allowing a user to view the entities in an application file for a mobile device and selecting those entities for which performance monitoring is to be implemented. The instrumentation tool adds performance monitoring methods to the application file and generates a new instrumented application file that is transferred to the mobile device. When the instrumented application file is executed on the mobile device, the performance monitoring methods instrumented into the file execute generating data in a performance log file that is stored on the mobile device. This performance log file may be transferred to a remote device for further analysis in addition to viewing the performance log file on the mobile device.