The article discusses the performance improvements made to the classic game DOOM through the fastDOOM project, which aimed to optimize the game for older hardware. The author analyzes the performance gains achieved by fastDOOM and explores the technical details behind the optimizations. The article also touches on the history of DOOM's development and the various versions of the game. The author's experiments with fastDOOM on an IBM PS/1 486-DX2 66Mhz machine demonstrate significant performance improvements.