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Evan
571f58440d
## Summary Follow-up to #4507, moving the memory-footprint campaign to the **main thread** (client). Two parts: a headless browser measurement harness, and a first optimization round that cuts the main-thread live heap on Giant World Map by **23%** (166 → 128 MB at tick 2000). ## Part 1 — `npm run perf:client-mem`: headless main-thread memory harness Drives a real singleplayer game in headless Chromium and measures the **page's isolate only** (the core sim worker is a separate CDP target): - Starts its own vite dev server on a private port (default 9017) so it always measures the current checkout. - Double-forced-GC checkpoints every `--window` ticks: JS heap, ArrayBuffer backing-store bytes (`Runtime.getHeapUsage`), DOM nodes, listeners, ticks/s. - `--snapshot-at <ticks>` writes V8 heap snapshots, analyzable with the retainer/summary tools from #4507. - Spoofs the unmasked WebGL renderer string via an init script so the software-GL gate (#4324) admits SwiftShader — no game code touched; rendering still runs software (hence the rAF throttle). - End-of-run screenshot as a rendering sanity check. Baseline (Giant World Map, 400 bots, 12,000 ticks): ~176 MB live, of which ~116 MB is **static per-tile buffers** allocated up front for the 8M-tile map — flat during play, no leaks. ## Part 2 — drop three map-sized render-layer buffer copies | Buffer | Before | After | |---|---|---| | `TrailPass.cpuTrailState` | 15.3 MB copy | **deleted** — dead code; every upload entry point sets the live reference to TrailManager's array | | `RailroadPass.cpuRailroadState` | 15.3 MB across 2 arrays | references `RailroadCache.railroadState` (stable identity, mutated in place) | | `RailroadPass.cpuGhostRailState` | ↑ | sparse `Map<ref, value>`; preview diffs applied as per-texel `texSubImage2D` writes (path-sized work instead of a full 8 MB texture upload per build-preview mouse move) | | `TerrainPass` + `MapRenderer` terrain bytes | 7.6 MB (one buffer, two retainers) | `terrainSource()` provider — re-bakes (theme change, context restore) regenerate from the live game map, which already reflects water-nuke conversions | Tick-2000 snapshot comparison (giant world, 400 bots): **166.4 → 128.4 MB**. ## Verification - `tsc --noEmit`, eslint, full test suite (1924 tests) pass. - 2000-tick headless giant-world game after the change: no GL pageerrors, end-of-run screenshot renders terrain/territory/borders/names correctly, sim speed unchanged (~5 ticks/s headless). - Ghost-rail ops flush before the zoom-fade early-return, so the op queue can't grow while previewing at low zoom. - WebGL context restore recreates all passes fresh and the owner re-uploads state (existing `onContextRestored` path), consistent with the new reference-based buffers. Note: heap snapshots in `tests/perf/output/` are gitignored; the numbers above are from runs recorded in the PR discussion. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>