JefiFast: Accelerating Jefimenko's Equations with Memory-Centric Optimizations and Multi-GPU Parallelism. - He, Bing; Peng, Shengyu; Sun, Nan; Li, Guoliang; Zhu, Xiaofei; Xu, Peng; Shen, Xiaowei (Physics (2624-8174), 2026)