Unreal Engine 5.9 demo runs in browser at 21MB, slimmed down by Claude and Codex
jradoff · x · 2026-11-16
Epic developer @EpicVogel showcased UE 5.9's web support with a hobby demo: an excavator, a fully destructible house, and diggable soil — about 21MB on first visit before it's interactive, and it runs on mobile. Engine code and shaders were heavily stripped to cut compile times (Safari especially).
jradoff highlighted the key detail: part of the slimming was just pointing Claude and Codex at the engine and saying "make it smaller" — game engines are becoming agent-tunable.
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