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PR_26175_DELTA_001: optimize runtime tick advance
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‎docs_build/dev/ProjectInstructions/backlog/BACKLOG_MASTER.md‎

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- [ ] Delta - Shared JS consolidation
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- [ ] Delta - API client consolidation
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- [ ] Delta - Runtime performance audit
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- [x] Delta - Runtime performance audit
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- Completion reference: PR_26175_DELTA_001_Runtime_Performance_Optimization.
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- [ ] Delta - Engine test coverage improvements
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- [ ] Delta - Event system audit
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- [ ] Delta - Controls runtime framework audit

‎docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization-branch-validation.md‎

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# PR_26175_DELTA_001 Branch Validation
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| Gate | Status | Evidence |
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| --- | --- | --- |
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| Current branch before work | PASS | `main` |
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| Worktree before work | PASS | Clean |
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| Local/origin sync before work | PASS | `0 0` after `git pull --ff-only` |
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| Team ownership | PASS | Team Delta owns Runtime, Performance, and Runtime test coverage. |
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| Work branch | PASS | `PR_26175_DELTA_001_Runtime_Performance_Optimization` |
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| Previous Delta PR closed | PASS | No active Delta PR was present before PR_001. |
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| Scope boundary | PASS | Runtime tick-loop optimization, focused test, backlog/report artifacts only. |
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## Instruction Reads
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PASS - All files under `docs_build/dev/ProjectInstructions/` were read before implementation.

‎docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization-manual-validation-notes.md‎

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# PR_26175_DELTA_001 Manual Validation Notes
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- Confirmed Team Delta ownership covers Runtime, Performance, and Runtime test coverage.
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- Confirmed the optimization is limited to fixed-step runtime tick advancement.
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- Confirmed `advanceRuntimeTick(...)` now reuses the existing `deltaSeconds` value when present.
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- Confirmed legacy tick objects without `deltaSeconds` still advance successfully.
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- Confirmed no browser-owned data, API contract, UI, or tool state changes were introduced.
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- Confirmed backlog completion reference was added for `Delta - Runtime performance audit`.
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- Confirmed source branch disposition should remain `retained`.

‎docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization-requirement-checklist.md‎

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# PR_26175_DELTA_001 Requirement Checklist
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| Requirement | Status | Notes |
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| --- | --- | --- |
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| Team Delta ownership only | PASS | Runtime, Performance, and Runtime test coverage are Delta-owned. |
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| One PR purpose | PASS | Fixed-step tick-loop performance optimization only. |
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| Preserve backward compatibility | PASS | Added legacy tick fallback when `deltaSeconds` is absent. |
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| Update backlog | PASS | `Delta - Runtime performance audit` marked complete. |
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| Update tool state if applicable | PASS | Not applicable; no tool tile/status changed. |
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| Produce governance reports | PASS | Summary, branch validation, checklist, validation lane, manual notes, Codex diff, changed-file list, and ZIP. |
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| Runtime validation | PASS | Targeted node checks and runtime tick test passed. |
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| No unrelated files | PASS | Changes are limited to runtime tick loop, its focused test, backlog, and reports. |
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| No branch deletion | PASS | Source branch retained. |
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## Compatibility Notes
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- `advanceRuntimeTick(...)` preserves the same public tick shape.
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- Callers with old tick objects still get a computed `deltaSeconds` value.
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- Invalid fixed-delta errors remain unchanged.

‎docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization-validation.md‎

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# PR_26175_DELTA_001 Validation Lane
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## Commands
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```powershell
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node --check src/engine/runtime/runtimeTickLoop.js
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node --check tests/engine/RuntimeTickLoop.test.mjs
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node tests/engine/RuntimeTickLoop.test.mjs
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```
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## Results
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| Command | Status |
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| --- | --- |
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| `node --check src/engine/runtime/runtimeTickLoop.js` | PASS |
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| `node --check tests/engine/RuntimeTickLoop.test.mjs` | PASS |
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| `node tests/engine/RuntimeTickLoop.test.mjs` | PASS |
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## Browser Validation
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SKIP - No browser UI files changed.
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## Playwright Validation
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SKIP - Runtime tick-loop internals are covered by the focused Node runtime test.

‎docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization.md‎

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# PR_26175_DELTA_001_Runtime_Performance_Optimization
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## Summary
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Team Delta completed a focused runtime performance optimization for the fixed-step runtime tick loop.
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The runtime now reuses the precomputed `deltaSeconds` value already stored on a tick when advancing frames. This avoids recalculating the fixed delta seconds on every frame while preserving compatibility for legacy tick objects that do not yet carry `deltaSeconds`.
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## Scope
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- Team: Delta
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- Backlog item: `Delta - Runtime performance audit`
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- Runtime file changed: `src/engine/runtime/runtimeTickLoop.js`
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- Test file changed: `tests/engine/RuntimeTickLoop.test.mjs`
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- Backlog updated: `docs_build/dev/ProjectInstructions/backlog/BACKLOG_MASTER.md`
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## Runtime Impact
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PASS - Fixed-step runtime advancement behavior remains backward compatible.
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- Existing tick objects from `createRuntimeTickLoop(...)` retain `deltaSeconds`.
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- `advanceRuntimeTick(...)` reuses that value.
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- Legacy tick objects without `deltaSeconds` still compute a valid fallback.
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- Invalid fixed-delta handling is unchanged.
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## Backlog Update
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PASS - `Delta - Runtime performance audit` is marked complete with this PR as the completion reference.
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## Tool State Update
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SKIP - No Build Path tool status or tool tile state changed. This PR affects runtime internals only.
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## Validation Summary
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PASS - Targeted runtime validation completed.
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See `PR_26175_DELTA_001_Runtime_Performance_Optimization-validation.md` for command details.
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## Branch Disposition
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Source branch should be retained after merge unless OWNER later approves branch deletion.

‎docs_build/dev/reports/codex_changed_files.txt‎

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assets/theme-v2/js/gamefoundry-partials.js
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assets/theme-v2/js/legal-document-page.js
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assets/theme-v2/partials/footer.html
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docs_build/dev/reports/PR_26175_OWNER_054-legal-corrected-package.md
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docs_build/dev/reports/codex_changed_files.txt
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docs_build/dev/reports/codex_review.diff
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docs_build/dev/reports/coverage_changed_js_guardrail.txt
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docs_build/dev/reports/playwright_v8_coverage_report.txt
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legal/community-guidelines.html
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legal/community-guidelines.md
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legal/cookie-policy.html
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legal/cookie-policy.md
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legal/cookies-policy.html
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legal/copyright-policy.html
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legal/copyright-policy.md
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legal/disclaimer.html
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legal/dmca-policy.html
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legal/dmca-policy.md
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legal/index.html
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legal/index.md
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legal/legal-nav.js
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legal/privacy-policy.html
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legal/privacy-policy.md
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legal/terms.html
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legal/terms-of-service.html
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legal/terms-of-service.md
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tests/playwright/tools/RemainingLegalPages.spec.mjs
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docs_build/dev/ProjectInstructions/backlog/BACKLOG_MASTER.md / updated
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src/engine/runtime/runtimeTickLoop.js / updated
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tests/engine/RuntimeTickLoop.test.mjs / updated
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docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization.md / added
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docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization-branch-validation.md / added
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docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization-requirement-checklist.md / added
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docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization-validation.md / added
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docs_build/dev/reports/PR_26175_DELTA_001_Runtime_Performance_Optimization-manual-validation-notes.md / added
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docs_build/dev/reports/codex_changed_files.txt / updated
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docs_build/dev/reports/codex_review.diff / updated

‎docs_build/dev/reports/codex_review.diff‎

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‎src/engine/runtime/runtimeTickLoop.js‎

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});
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}
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const deltaSeconds = Number.isFinite(tick.deltaSeconds) && tick.deltaSeconds > 0
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? tick.deltaSeconds
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: tick.fixedDeltaMs / 1000;
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return createTickResult({
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tick: Object.freeze({
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frame: tick.frame + 1,
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elapsedMs: tick.elapsedMs + tick.fixedDeltaMs,
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fixedDeltaMs: tick.fixedDeltaMs,
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deltaSeconds: tick.fixedDeltaMs / 1000,
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deltaSeconds,
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}),
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errors: [],
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});

‎tests/engine/RuntimeTickLoop.test.mjs‎

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const nextResult = advanceRuntimeTick(startResult.tick);
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assert.equal(nextResult.valid, true);
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assert.deepEqual(nextResult.tick, { frame: 1, elapsedMs: 100, fixedDeltaMs: 100, deltaSeconds: 0.1 });
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assert.equal(
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nextResult.tick.deltaSeconds,
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startResult.tick.deltaSeconds,
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'Runtime tick advance should reuse the precomputed deltaSeconds value.'
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);
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const legacyTickResult = advanceRuntimeTick({ frame: 2, elapsedMs: 200, fixedDeltaMs: 100 });
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assert.equal(legacyTickResult.valid, true);
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assert.deepEqual(
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legacyTickResult.tick,
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{ frame: 3, elapsedMs: 300, fixedDeltaMs: 100, deltaSeconds: 0.1 },
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'Runtime tick advance should preserve compatibility for ticks without deltaSeconds.'
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);
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const invalidResult = createRuntimeTickLoop({ fixedDeltaMs: 0 });
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assert.equal(invalidResult.valid, false);

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