A rig probe found that R9's .map file is terrain data, not a picture, and that Rust+ already caches the rendered JPEG, while the game's own render stalls the main thread for 8.5 s. D109-D118 from the org lead; R9 amended by D110; phase 14 row updated. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY