US Patent 10241901 Web application performance testing

A system for performance testing a web application initializes to be instrumented a subset of methods of the web application to be tested in response to a request, and then tests the application based on the subset of methods. The system generates an instrumented call tree and corresponding stack traces for each request in response to the testing, and determines one or more methods that take longer than a predetermined time period to execute using the instrumented call trees and the stack traces. The system then determines additional methods to be tested and adds the determined additional methods to the subset of methods and repeats the testing.