A method for processor parameter adjustment using a performance optimization engine is provided. An aspect includes receiving, by the performance optimization engine comprising a hardware module in a processor of a computer system, a request to adjust an operating parameter of the processor from software that is executing on the computer system. Another aspect includes determining an adjusted value for the operating parameter by the performance optimization engine during execution of the software. Another aspect includes setting the operating parameter to the adjusted value in a parameter register of the processor. Yet another aspect includes executing the software according to the parameter register by the processor.