Abstract: The INTELLIGENT ELECTRONIC DEVICE RESPONSE TIME PERFORMANCE OPTIMIZATION APPARATUSES (“IEDP”) transform Intelligent Electronic Device (IED) substation designs and arrangements comprising one or more IED profiles, a plurality of input factors or configurations values, and a set of stimuli triggers using IEDP components into estimated and predicted performance metrics' values. In some implementations, the disclosure provides a processor-implemented method for determining one or more expected performance values of a substation automation system in non-emulated scenarios. The determined performance values allow substation designers to build reliable solutions tested under typical and atypical scenarios. Additionally the IEDP provides optimization tools to improve a substation design with respect to one or more performance metrics.