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This paper presents a new way to analyze performance between integer order and fractional order controller with a time delay for a typical interacting coupled tank system using MATLAB FOMCON toolbox. Here, our work aims to analyze the performance characteristics of integer order and fractional order PID controller on the current integer order plant obtaining minimum objective function by Nelder - Mead optimization technique with different performance metrics ISE, ITSE and IAE. Next our work shows to make comparison between integer order PID controller based on Ziegler Nichols performance and fractional order PID controller on time domain characteristics. The proposed method aims finally to analyze overall desired performance on fractional order PID controller by adding two extra degrees of freedom over the integer order PID controller with different performance criteria.