In the winter of 2024, the author restored an IBM PS/1 486-DX2 66Mhz computer and benchmarked its performance running DOOM, achieving 21.5 fps. They discovered the fastDOOM port, which increased the frame rate to 30.1 fps without sacrificing functionality. The post details the origins of fastDOOM from PCDOOM v2, explains the improvements made by Victor 'Viti95' Nieto through various commits, and explores the technical intricacies of video modes used by DOOM. It also highlights the advantages and disadvantages of mode 13h and mode Y in rendering and how these were optimized further in fastDOOM.
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