Clustered lighting — 200+ dynamic lights
Forward+ clustered lighting on WebGPU handles hundreds of moving point lights in one pass. Classic forward rendering on WebGL2 tops out around 16 — the slider cap shows the difference.
Reduced motion is on — showing the poster instead of the live scene.
Drag the slider up to 256 lights on WebGPU. With ?forceWebGL=1 the cap drops to 16 and the UI says so.