1. A method to be performed by a computer system having at least one computer, storage media for physical implementation of an emulated sequence of instructions of the computer and translated from an original sequence of instructions, and at least one component that produces dynamic execution information, said method improving performance of the emulated sequence of instructions and comprising the steps of: producing first dynamic execution information in response to executing the emulated sequence of instructions; and changing the computer system for producing different dynamic execution information in response to said first dynamic execution information.