Lumen Global Illumination Software vs Hardver Ray Tracing Tradeoffs: Competitive Benchmark Analysis and Hardver Interactions

[Sebastian Miller]

I’ve been running controlled benchmarks comparing Lumen against hardware ray-traced illumination in a competitive FPS config locked at 240+ FPS, and the frametime variance is where things get ugly. Lumen’s screen-space radiance passes keep my p99 frametimes tight on a surface cache card, but I’m seeing micro-stutters during heavy shadow-caster movement that hardware RT smooths out at the cost of a 30-40% frame budget hit. Before I commit to a build guide, I need real data from people pushing high-refresh competitive titles.

How are you balancing GI quality against frametime predictability when every millisecond matters for reaction time? Specifically—have you measured whether the screen-space radiance approximation introduces more visible hitching than hardware RT in scenes with dynamic occluders? And on the hardware scaling front, is the surface cache overhead actually paying off in consistent frametimes, or does it plateau once you exceed a certain light count? What’s your ideal p99 frametime ceiling for competitive play, and how much visual fidelity are you willing to sacrifice to hit it?

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