The SCORE intrusion response engine was tested on extensive synthetic power grids, including a 10k-bus model. A discrete event simulation tool, designated as DESTine, classified impacts of denial-of-service (DoS) attacks in complex networks such as ACTIVSg500, ACTIVSg2000, and ACTIVSg10k. The upgraded scenario evaluation confirms near real-time performance, a key milestone in assessing resilience at national-scale grid sizes.