AI-assisted disclosure: Codex assisted with the experiments, scripts and writing. Measurements below come from saved test runs, with failures and untested conditions retained. Short answer: Spirula Studio's Windows Vulkan build produced a 100,000-splat Garden scene that loaded in Spark 2.4.0 with Three.js 0.186.1. A short 2,000-iteration run took 13.561 seconds for the whole process. Its 24.80 MB PLY converted to a 1.95 MB SPZ. Both rendered in a local WebGL scene, including an independent...