A technical dive into JDM: Japanese Drift Master

A technical deep-dive into JDM: Japanese Drift Master, an open-world racing game built on Unreal Engine 5.4. Covers graphics preset comparisons (Low through Ultra), Lumen GI and reflection options, resolution upscaling (DLSS4, TSR, XeSS), and performance benchmarks on a GTX 1070 below minimum specs. Steam Deck compatibility is tested with notes on battery drain, VRAM issues, and UI bugs. A notable UE5 engine bug is identified in GetLightFadeFactor where r.LightMaxDrawDistanceScale incorrectly dims lights at lower shadow settings without scaling the fade range — a fix is proposed and reported to both the game devs and potentially Epic. Known issues include shader stutter, missing shader precompilation, and graphics settings not persisting between sessions.