[nulltask]

Performance pass over devel, measured before changing anything.

How it was measured

• Exports: the whole export benchmark (pnpm run bench, 918 cases) to rank the slowest calls.
• Play loop: a 160 s stress chart (≈ 6,700 notes, 8 lanes, BPM changes) on AUTO in a production build, Synesthesia skin. requestAnimationFrame timing, ?perf section timing and Chrome performance traces (unminified build, CPU profile aggregated by function).
• Library and chart loading: 200 dense charts dropped at once took 322 ms; parsing, resolving and preparing the stress chart take ~2 ms each. Nothing to fix there.

What the play loop spends

Before the change the frame loop used ~25 % of the main thread; the note judging and the shared playfield passes were ~0.1 ms a frame. Nearly all of it was Synesthesia's effects:

• Pixi rendering (WebGPU command execution and buffer writes);
• the particle container re-uploading its particles;
• the skin building its particles each frame.

Changes

1. PMS RANDOM_PLAYABLE (randomizePMSPlayableLanes), the slowest benchmark case by 4×.
   • It walked all 9! permutations twice and tested each chord's image against ten masks.
   • Every impossible chord has three lanes and a permutation is a bijection, so the search now checks each chord's three-lane subsets against a 512-entry table.
   • It runs as one loop that records valid ordinals, and the pick replays the order to the chosen one.
   • Result: 10.2 ms → 3.1 ms on the benchmark, 24 ms → 9 ms on a dense 600-row chart.
   • The same permutation is picked: an equivalence test keeps the previous search as its reference.
2. Particles of the built-in skins (pixi-kit/particle-layer.ts).
   • Colors: Pixi's Particle renders from its packed color, and the tint setter parsed a Color for every point every frame. The layer now writes the packed color directly, computed as Pixi computes it (tested against Pixi's own values).
   • Placement: the layer also looked up its index among its siblings twice per point. It now does so once per frame.
   • Result: the frame loop's CPU time −12 % (254 → 223 ms per second); the skin's per-frame build 10.3 % → 7.0 % of the trace.
   • The particles' tint / alpha getters are no longer kept in step; nothing reads them.
3. ?perf on the built-in play view now prints its per-second section summary. It timed sections but never ended a frame, so samples piled up unreported.

Left as is

• Pixi's particle upload and WebGPU draw. They are inherent to particles that move every frame; reducing them would change the skin's look.
• The Debug Menu's multiline monitor. It reads scrollHeight on its interval, about 0.5 %.

Testing

• Unit:
  • PMS equivalence over random charts and draws, plus the three-lane subset helper.
  • Particle color packing against Pixi's Particle; the colour test now asserts the layer never uses the setters.
• Checked on screen: Synesthesia's effects (point clouds, floor, sparks, dust) render as before.
• pnpm run check (0 errors), pnpm test (7199 passed).

🤖 Generated with Claude Code

[github-actions]

Exports Benchmark

🔴 6 regressions · 3 improvements · 15 within noise · 699 compared

_{1d4167b3 → 48ffeed4 · 3 runs base / 3 runs head · a regression or improvement is a change past ±8% whose runs do not overlap · times are per call (median)}

Regressions (6)

API	Base	Head	Change	Run spread (base / head)
player-scene-model.systemSoundSetFromBeatoraja	295 ns	349 ns	18.3% slower	±5.2% / ±5.9%
player-browser.loadBeatorajaThemeFromFiles	517 ns	609 ns	17.9% slower	±8.3% / ±2.6%
player-browser.loadBeatorajaTexturesFromBundle	301 ns	351 ns	16.7% slower	±4.9% / ±2.3%
player-scene-model.playResultFromCourseRun	709 ns	813 ns	14.7% slower	±7.3% / ±2.1%
player-engine.lanes.randomizePMSPlayableNotes	7.71 µs	8.70 µs	12.9% slower	±1.6% / ±2.7%
player-engine.records.mergeCourseStageRecord	22.1 ns	24.5 ns	10.9% slower	±2.1% / ±5.5%

Improvements (3)

API	Base	Head	Change	Run spread (base / head)
player-engine.lanes.randomizePMSPlayableLanes	20.9 ms	7.17 ms	65.7% faster	±0.6% / ±0.4%
skin-beatoraja.scene.beatorajaDifficultyOps	18.3 ns	16.6 ns	9.3% faster	±8.8% / ±0.4%
player-engine.course.normalizeCourseTrophies	39.5 ns	36.5 ns	7.8% faster	±3.4% / ±3.5%

Changed packages

player-browser, player-engine: 309 cases compared, median 0.5% faster.

All 309 cases

API	Base	Head	Change	Run spread (base / head)
player-browser.alignAudioChunk	6.06 ns	6.31 ns	4.0% slower	±0.3% / ±1.0%
player-browser.applySilentModePlayback	13.8 ns	14.2 ns	2.8% slower	±0.4% / ±0.8%
player-browser.applySystemAudioSessionType	12.6 ns	13.0 ns	3.2% slower	±0.3% / ±0.8%
player-browser.asLoadedBytes	7.54 ns	7.85 ns	4.0% slower	±1.1% / ±0.7%
player-browser.blendCodeToPixi	6.10 ns	6.34 ns	3.9% slower	±1.0% / ±0.2%
player-browser.BrowserChartCollectionStore	2.44 ms	2.45 ms	0.4% slower	±0.1% / ±0.2%
player-browser.buildAudioBus	1.97 µs	4.03 µs	104.5% slower ·	±30.4% / ±5.0%
player-browser.chartPlayVariantForBeatorajaVariant	6.27 ns	5.90 ns	6.0% faster	±2.5% / ±1.8%
player-browser.checkBrowserCompat	154 ns	157 ns	1.5% slower	±1.1% / ±2.2%
player-browser.computeChartFileHashes	54.9 µs	55.0 µs	0.3% slower	±1.0% / ±2.6%
player-browser.computeChartFileSHA256	49.3 µs	49.5 µs	0.5% slower	±3.1% / ±1.3%
player-browser.computeSHA256Hex	44.8 µs	45.0 µs	0.5% slower	±1.4% / ±3.9%
player-browser.createAudioService	7.07 µs	6.76 µs	4.3% faster	±6.7% / ±4.2%
player-browser.createBeatorajaSceneKitCaches	80.2 ns	80.2 ns	0.1% faster	±13.8% / ±8.0%
player-browser.createBeatorajaSkinLoadContext	176 ns	175 ns	0.9% faster	±1.2% / ±1.0%
player-browser.createBeMusicSkinRegistry	1.07 µs	1.05 µs	1.8% faster	±0.6% / ±0.6%
player-browser.createChartHashLookup	136 ns	139 ns	1.9% slower	±12.3% / ±1.6%
player-browser.createCourseChartRecord	1.59 µs	1.57 µs	1.3% faster	±3.2% / ±0.3%
player-browser.createCroppedBeatorajaTexture	6.60 ns	6.91 ns	4.7% slower	±0.3% / ±0.4%
player-browser.createDecideScene	251 µs	248 µs	1.1% faster	±4.2% / ±1.8%
player-browser.createEagerDropPathPredicate	1.02 µs	1.00 µs	1.8% faster	±0.4% / ±0.6%
player-browser.createNewCourseEntry	9.83 ns	10.2 ns	4.1% slower	±0.1% / ±0.3%
player-browser.createNonstopAssets	18.7 µs	18.5 µs	1.0% faster	±1.0% / ±0.9%
player-browser.createPlayScene	154 µs	156 µs	0.8% slower	±1.4% / ±0.8%
player-browser.createRandomCourseEntry	1.50 µs	1.53 µs	2.4% slower	±4.6% / ±3.9%
player-browser.createResultScene	58.4 µs	62.2 µs	6.5% slower	±7.8% / ±12.2%
player-browser.createSelectController	14.0 µs	13.9 µs	0.5% faster	±0.6% / ±1.2%
player-browser.createSelectScene	47.8 µs	48.3 µs	1.0% slower	±26.2% / ±2.2%
player-browser.defaultBeatorajaSkinConfig	42.7 ns	41.9 ns	1.9% faster	±0.6% / ±0.5%
player-browser.defaultBrowserWorkerCount	5.99 ns	6.18 ns	3.1% slower	±0.6% / ±0.3%
player-browser.DeferredDroppedFile	2.58 µs	2.54 µs	1.9% faster	±1.6% / ±0.2%
player-browser.describeChartCollection	7.98 ns	8.29 ns	3.9% slower	±0.6% / ±0.5%
player-browser.describeRecordingFormat	6.36 ns	6.66 ns	4.6% slower	±1.8% / ±17.7%
player-browser.drawBrowserRandomCourse	5.06 µs	5.07 µs	0.3% slower	±0.9% / ±4.9%
player-browser.executeBrowserTask	9.22 µs	9.45 µs	2.4% slower	±0.7% / ±2.6%
player-browser.findBeatorajaThemeBGM	2.96 µs	2.99 µs	1.1% slower	±0.8% / ±0.5%
player-browser.flipRectToPixi	6.02 ns	6.21 ns	3.1% slower	±0.8% / ±0.2%
player-browser.getBrowserWorkerCount	6.13 ns	6.42 ns	4.6% slower	±1.1% / ±1.2%
player-browser.getMasterVolume	6.16 ns	6.56 ns	6.5% slower	±1.4% / ±0.8%
player-browser.getSystemAudioSession	7.18 ns	7.57 ns	5.3% slower	±1.9% / ±0.5%
player-browser.isBeatorajaLuaSkinFilePath	41.5 ns	41.0 ns	1.1% faster	±1.4% / ±0.1%
player-browser.isBeatorajaSkinIndicator	136 ns	136 ns	±0.0%	±1.1% / ±0.4%
player-browser.isChartFilePath	36.3 ns	35.4 ns	2.4% faster	±1.1% / ±0.2%
player-browser.isCourseFilePath	476 ns	477 ns	0.1% slower	±0.7% / ±0.5%
player-browser.isLR2SkinFilePath	41.8 ns	41.1 ns	1.6% faster	±1.5% / ±0.4%
player-browser.loadAssetBytes	236 ns	236 ns	0.2% slower	±1.3% / ±1.0%
player-browser.loadBeatorajaChartImages	545 ns	561 ns	2.9% slower	±1.5% / ±0.3%
player-browser.loadBeatorajaFonts	633 ns	642 ns	1.4% slower	±1.8% / ±0.2%
player-browser.loadBeatorajaSceneKit	16.7 µs	16.8 µs	0.5% slower	±1.4% / ±0.1%
player-browser.loadBeatorajaTexturesFromBundle	301 ns	351 ns	16.7% slower 🔴	±4.9% / ±2.3%
player-browser.loadBeatorajaThemeFromFiles	517 ns	609 ns	17.9% slower 🔴	±8.3% / ±2.6%
player-browser.loadChartCollectionFromDrop	1.21 ms	1.21 ms	0.2% slower	±0.1% / ±0.3%
player-browser.loadChartCollectionFromFiles	1.21 ms	1.21 ms	±0.0%	±0.3% / ±0.6%
player-browser.logger	11.0 ns	10.8 ns	1.8% faster	±0.3% / ±0.3%
player-browser.masterOutput	13.1 ns	13.1 ns	0.2% faster	±0.3% / ±0.2%
player-browser.materializeDroppedFiles	1.88 µs	1.91 µs	1.8% slower	±0.6% / ±1.8%
player-browser.md5HexOfBytes	739 ns	736 ns	0.5% faster	±0.2% / ±0.2%
player-browser.mergeCompressorParams	108 ns	109 ns	1.0% slower	±2.0% / ±6.7%
player-browser.normalizeBrowserWorkerCount	6.21 ns	6.00 ns	3.4% faster	±0.5% / ±0.7%
player-browser.parseCompressorMode	18.1 ns	18.1 ns	0.4% faster	±0.8% / ±0.1%
player-browser.pickBeatorajaPlayableSkinVariant	20.5 ns	20.3 ns	0.8% faster	±0.4% / ±0.5%
player-browser.pickBeatorajaPlayableVariant	6.31 ns	6.01 ns	4.8% faster	±1.0% / ±0.5%
player-browser.pickRecorderMIMEType	787 ns	792 ns	0.7% slower	±2.5% / ±0.8%
player-browser.readCourseFile	4.58 µs	4.57 µs	0.2% faster	±0.5% / ±0.7%
player-browser.readDroppedFiles	251 ns	255 ns	1.4% slower	±7.5% / ±1.4%
player-browser.readFilesIntoBytesMap	4.56 µs	4.50 µs	1.3% faster (I/O)	±2.6% / ±2.7%
player-browser.recorderMIMECandidates	1.88 µs	1.90 µs	1.2% slower	±2.6% / ±1.3%
player-browser.recordingAudioCodecs	6.19 ns	5.91 ns	4.5% faster	±1.6% / ±1.0%
player-browser.recordingFileExtension	35.4 ns	35.1 ns	0.9% faster	±1.2% / ±0.6%
player-browser.recordingVideoCodecs	51.2 ns	53.7 ns	4.7% slower	±5.1% / ±8.3%
player-browser.Rectangle	6.25 ns	6.00 ns	3.9% faster	±0.8% / ±1.1%
player-browser.releaseBeatorajaSceneKitAssets	118 ns	137 ns	16.1% slower ·	±10.2% / ±9.2%
player-browser.resolveBeatorajaChartImage	6.17 ns	5.95 ns	3.5% faster	±0.3% / ±0.6%
player-browser.resolveBeatorajaSkinConfig	131 ns	131 ns	0.2% faster	±5.6% / ±1.7%
player-browser.resolveCaptureSize	6.37 ns	6.05 ns	5.0% faster	±0.9% / ±0.3%
player-browser.resolveChartAsset	2.68 µs	2.66 µs	0.7% faster	±0.4% / ±0.4%
player-browser.resolveChartAudioAsset	11.2 µs	11.1 µs	0.6% faster	±0.6% / ±1.2%
player-browser.resolveChartBGAAsset	51.5 µs	51.3 µs	0.5% faster	±0.4% / ±0.2%
player-browser.resolveChartImageAsset	5.71 µs	5.65 µs	1.0% faster	±0.4% / ±0.8%
player-browser.resolveChartSource	8.77 ns	8.32 ns	5.2% faster	±0.3% / ±0.6%
player-browser.resolveCourseEntry	65.2 ns	64.4 ns	1.2% faster	±0.4% / ±0.8%
player-browser.resolveCourseFolders	185 ns	180 ns	3.0% faster	±5.5% / ±3.2%
player-browser.resolveCourseMakerFolders	551 ns	540 ns	2.0% faster	±9.2% / ±8.7%
player-browser.resolveDropFilePath	211 ns	211 ns	0.1% faster	±0.3% / ±0.2%
player-browser.resolveFrameTimestamp	6.19 ns	6.00 ns	2.9% faster	±0.6% / ±0.4%
player-browser.resolveRendererPreference	147 ns	147 ns	0.1% slower	±0.4% / ±1.1%
player-browser.resolveRenderResolution	194 ns	195 ns	0.5% slower	±0.2% / ±0.9%
player-browser.resolveSelectListWindow	11.4 ns	11.4 ns	0.1% faster	±0.5% / ±0.2%
player-browser.resolveSilentModeAudioSessionType	6.13 ns	5.97 ns	2.6% faster	±1.1% / ±0.3%
player-browser.runBrowserTask	1.08 ms	1.08 ms	±0.0%	±0.0% / ±0.0%
player-browser.sanitizeBusVolume	6.55 ns	6.23 ns	4.8% faster	±0.1% / ±0.4%
player-browser.sanitizeMasterVolume	6.72 ns	6.35 ns	5.5% faster	±0.6% / ±0.5%
player-browser.SessionScene	576 ns	570 ns	1.1% faster	±1.1% / ±0.2%
player-browser.setMasterVolume	503 µs	420 µs	16.5% faster ·	±28.4% / ±4.6%
player-browser.shouldCaptureFrame	6.22 ns	6.03 ns	3.1% faster	±0.8% / ±0.7%
player-browser.splitDroppedChartAndThemeFiles	2.79 µs	2.79 µs	0.2% faster	±0.5% / ±0.3%
player-browser.summarizeBeatorajaPlaySkins	123 ns	121 ns	1.0% faster	±2.9% / ±4.1%
player-browser.summarizeBrowserCompat	67.2 ns	67.0 ns	0.3% faster	±0.8% / ±0.3%
player-browser.supportsSystemAudioSession	8.02 ns	7.73 ns	3.7% faster	±0.7% / ±0.4%
player-browser.supportsWebCodecsRecording	11.1 ns	11.0 ns	1.1% faster	±0.4% / ±0.2%
player-engine.course.appendCourseDraftStage	170 ns	171 ns	0.4% slower	±0.8% / ±1.2%
player-engine.course.applyCourseLongNoteConstraint	47.6 ns	47.4 ns	0.4% faster	±2.4% / ±0.2%
player-engine.course.applyUndefinedLongNoteMode	42.1 ns	42.0 ns	0.2% faster	±0.2% / ±1.2%
player-engine.course.beatorajaClearType	6.00 ns	6.22 ns	3.6% slower	±5.1% / ±0.5%
player-engine.course.buildLR2CourseHash	1.61 µs	1.60 µs	0.4% faster	±0.4% / ±0.6%
player-engine.course.buildNonstopCourseReplay	898 µs	880 µs	2.0% faster	±2.7% / ±1.0%
player-engine.course.countLR2UnplayedStages	6.77 ns	7.11 ns	5.0% slower	±0.6% / ±0.2%
player-engine.course.courseConstraintEnumName	48.5 ns	48.9 ns	0.8% slower	±0.6% / ±1.3%
player-engine.course.courseConstraintGroup	6.00 ns	6.18 ns	2.8% slower	±0.9% / ±0.3%
player-engine.course.CourseRun	368 µs	357 µs	2.9% faster	±2.2% / ±1.8%
player-engine.course.createCourseChartScore	89.6 ns	88.6 ns	1.0% faster	±2.4% / ±0.9%
player-engine.course.createCourseDraft	6.01 ns	6.29 ns	4.7% slower	±2.7% / ±1.1%
player-engine.course.createCourseStageRef	140 ns	135 ns	3.6% faster	±2.9% / ±3.0%
player-engine.course.createNonstopStageTiming	2.55 µs	2.55 µs	0.2% slower	±1.4% / ±1.3%
player-engine.course.decodeCourseText	1.18 µs	1.16 µs	1.4% faster	±2.9% / ±2.1%
player-engine.course.defaultCourseMakerConstraints	6.19 ns	5.92 ns	4.4% faster	±1.0% / ±0.7%
player-engine.course.drawRandomCourse	94.1 µs	93.4 µs	0.7% faster	±0.3% / ±0.4%
player-engine.course.evaluateCourseChartFilter	177 µs	177 µs	±0.0%	±1.1% / ±0.4%
player-engine.course.fetchTableHeaderCourses	6.61 µs	6.55 µs	0.8% faster	±0.7% / ±0.5%
player-engine.course.finishCourseDraft	3.80 µs	3.79 µs	0.3% faster	±0.2% / ±0.3%
player-engine.course.isClassCourseConstraints	30.4 ns	30.3 ns	0.3% faster	±0.7% / ±0.3%
player-engine.course.isCourseHiSpeedLocked	8.36 ns	7.97 ns	4.7% faster	±0.9% / ±0.8%
player-engine.course.isCourseStageFailed	78.5 ns	78.5 ns	0.1% faster	±0.2% / ±0.4%
player-engine.course.isLR2GradeCourse	6.53 ns	6.19 ns	5.1% faster	±1.2% / ±0.7%
player-engine.course.nonstopBPMAt	17.9 ns	17.9 ns	0.1% faster	±0.4% / ±0.1%
player-engine.course.normalizeCourseConstraints	227 ns	231 ns	1.5% slower	±0.7% / ±0.3%
player-engine.course.normalizeCourseTrophies	39.5 ns	36.5 ns	7.8% faster 🟢	±3.4% / ±3.5%
player-engine.course.parseBeatorajaCommandFolderFile	1.69 µs	1.68 µs	0.5% faster	±1.6% / ±1.1%
player-engine.course.parseBeatorajaCourseData	813 ns	813 ns	±0.0%	±0.5% / ±0.2%
player-engine.course.parseBeatorajaCourseFile	3.03 µs	3.04 µs	0.3% slower	±0.4% / ±1.0%
player-engine.course.parseBeatorajaRandomCourseData	107 ns	101 ns	4.8% faster	±3.9% / ±0.9%
player-engine.course.parseCourseChartFilter	8.57 µs	8.49 µs	1.0% faster	±1.2% / ±0.8%
player-engine.course.parseCourseConstraint	27.1 ns	26.9 ns	0.7% faster	±0.1% / ±0.4%
player-engine.course.parseLR2CourseFile	3.76 µs	3.72 µs	1.0% faster	±0.8% / ±0.3%
player-engine.course.parseLR2NonstopConnections	740 ns	749 ns	1.1% slower	±0.2% / ±0.5%
player-engine.course.parseTableHeaderCourses	1.13 µs	1.11 µs	1.5% faster	±1.0% / ±1.1%
player-engine.course.planNonstopCourse	1.07 µs	1.06 µs	1.0% faster	±0.6% / ±1.9%
player-engine.course.prepareNonstopCourse	55.6 µs	55.9 µs	0.4% slower	±0.4% / ±0.8%
player-engine.course.removeLastCourseDraftStage	31.8 ns	31.4 ns	1.3% faster	±0.8% / ±0.1%
player-engine.course.resolveCourseLaneOptions	19.0 ns	19.1 ns	0.5% slower	±0.6% / ±0.5%
player-engine.course.resolveCourseStagePlaySettings	89.1 ns	89.3 ns	0.2% slower	±1.2% / ±0.4%
player-engine.course.resolveCourseStages	27.5 ns	26.6 ns	3.3% faster	±13.4% / ±6.5%
player-engine.course.resolveCourseStageSettings	46.1 ns	46.2 ns	±0.0%	±0.4% / ±0.5%
player-engine.course.resolveGivenUpPlaySeconds	101 ns	99.3 ns	1.3% faster	±0.3% / ±1.6%
player-engine.course.resolveLR2GradeCoursePlaySettings	29.9 ns	29.7 ns	0.9% faster	±1.0% / ±0.5%
player-engine.course.resolveNonstopLastMeasure	6.17 ns	5.92 ns	4.1% faster	±1.2% / ±0.4%
player-engine.course.resolveNonstopRun	21.3 µs	20.7 µs	2.7% faster	±1.9% / ±1.5%
player-engine.course.resolveNonstopStageRanks	389 ns	317 ns	18.5% faster ·	±8.1% / ±17.2%
player-engine.course.resolveNonstopTempo	1.28 µs	1.12 µs	12.3% faster ·	±4.4% / ±8.6%
player-engine.course.resolveTableHeaderURL	2.29 µs	2.27 µs	0.8% faster	±0.6% / ±0.8%
player-engine.course.resolveTableModeKeys	16.3 ns	16.0 ns	2.4% faster	±1.0% / ±0.2%
player-engine.course.selectCourseCharts	185 µs	184 µs	0.3% faster	±0.9% / ±0.4%
player-engine.course.serializeBeatorajaCourseFile	93.5 ns	93.0 ns	0.6% faster	±0.6% / ±0.2%
player-engine.course.serializeLR2CourseFile	402 ns	406 ns	0.9% slower	±0.3% / ±1.4%
player-engine.course.stepLR2NonstopConnection	14.2 ns	13.9 ns	2.4% faster	±0.3% / ±0.5%
player-engine.course.stitchNonstopCourse	95.8 µs	95.5 µs	0.4% faster	±1.1% / ±1.5%
player-engine.course.withCourseConstraints	183 ns	182 ns	0.4% faster	±0.9% / ±0.2%
player-engine.course.withNonstopConnection	3.95 µs	3.96 µs	0.4% slower	±0.8% / ±0.5%
player-engine.createTempoClock	760 ns	770 ns	1.4% slower	±3.9% / ±1.5%
player-engine.display.adjustBeatorajaJudgeTiming	9.11 ns	8.70 ns	4.5% faster	±14.7% / ±0.9%
player-engine.display.createLR2ConstantScrollMapper	1.26 µs	1.24 µs	1.3% faster	±1.3% / ±1.3%
player-engine.display.createScrollDistanceMapper	1.40 µs	1.41 µs	0.4% slower	±2.3% / ±5.7%
player-engine.display.extractInvisiblePlayableNotes	1.53 µs	1.49 µs	2.6% faster	±2.1% / ±1.6%
player-engine.display.extractLandmineNotes	1.58 µs	1.54 µs	2.5% faster	±1.5% / ±1.8%
player-engine.display.extractPlayableNotes	7.16 µs	7.13 µs	0.4% faster	±0.9% / ±0.2%
player-engine.display.extractTimedNotes	7.03 µs	7.04 µs	0.1% slower	±0.9% / ±0.1%
player-engine.display.formatSeconds	48.6 ns	48.5 ns	0.3% faster	±5.2% / ±0.8%
player-engine.display.isImageResizeAlgorithm	13.6 ns	13.6 ns	0.7% faster	±0.3% / ±0.3%
player-engine.display.isLR2JudgeTimingAutoAdjust	6.18 ns	5.91 ns	4.3% faster	±0.5% / ±0.7%
player-engine.display.pickActiveBGACue	40.9 ns	40.8 ns	0.1% faster	±0.6% / ±0.3%
player-engine.display.pickActiveBGAKey	43.4 ns	43.4 ns	0.1% slower	±0.3% / ±0.2%
player-engine.display.resolveDisplayedDifficultyValue	7.14 ns	6.80 ns	4.7% faster	±1.2% / ±0.7%
player-engine.display.resolveDisplayedJudgeRankLabel	1.38 µs	1.38 µs	±0.0%	±0.9% / ±0.9%
player-engine.display.resolveDisplayedJudgeRankValue	1.42 µs	1.37 µs	3.8% faster	±2.7% / ±0.4%
player-engine.display.resolveDisplayedPlayLevelValue	7.93 ns	7.63 ns	3.8% faster	±1.6% / ±0.9%
player-engine.display.resolveJudgeTimingAutoAdjust	6.15 ns	5.89 ns	4.3% faster	±0.5% / ±0.4%
player-engine.display.ScrollDistanceMapper	1.41 µs	1.37 µs	2.6% faster	±2.8% / ±4.1%
player-engine.display.toTimedInvisibleNote	6.11 µs	6.06 µs	0.7% faster	±0.9% / ±0.5%
player-engine.display.toTimedLandmineNote	6.13 µs	6.07 µs	1.0% faster	±0.5% / ±0.4%
player-engine.display.toTimedPlayableNote	6.12 µs	6.07 µs	0.7% faster	±0.5% / ±0.2%
player-engine.lanes.addLongNotes	20.5 µs	20.5 µs	0.2% slower	±0.8% / ±0.4%
player-engine.lanes.appendFreeZoneInputChannels	2.87 µs	2.88 µs	0.5% slower	±1.8% / ±1.5%
player-engine.lanes.applySevenToNine	24.9 µs	25.2 µs	1.5% slower	±0.6% / ±1.1%
player-engine.lanes.clampExtraNoteDepth	6.13 ns	5.88 ns	4.1% faster	±0.3% / ±0.4%
player-engine.lanes.clampHRandomThresholdBPM	6.27 ns	6.03 ns	3.9% faster	±1.2% / ±0.6%
player-engine.lanes.clampLongNoteRate	6.36 ns	6.08 ns	4.4% faster	±0.8% / ±0.7%
player-engine.lanes.clampScrollRate	6.26 ns	6.00 ns	4.1% faster	±0.5% / ±0.3%
player-engine.lanes.clampScrollSection	6.27 ns	5.97 ns	4.7% faster	±1.3% / ±1.0%
player-engine.lanes.createInputTokenToChannelsMap	567 ns	587 ns	3.5% slower	±0.5% / ±2.7%
player-engine.lanes.createLaneBindings	1.22 µs	1.28 µs	4.6% slower	±2.9% / ±2.1%
player-engine.lanes.drawLaneRandomIndex	6.30 ns	6.05 ns	4.0% faster	±0.1% / ±1.0%
player-engine.lanes.isPlayableInputChannel	7.19 ns	6.84 ns	5.0% faster	±0.7% / ±0.7%
player-engine.lanes.isScratch	6.42 ns	6.12 ns	4.6% faster	±1.4% / ±0.3%
player-engine.lanes.parseLaneRandomSeed	155 ns	155 ns	0.1% faster	±0.1% / ±0.2%
player-engine.lanes.prepareMineModifier	20.6 µs	20.7 µs	0.6% slower	±1.2% / ±0.6%
player-engine.lanes.randomizeAllScratchNotes	9.29 µs	9.36 µs	0.8% slower	±1.0% / ±1.7%
player-engine.lanes.randomizeHRandomNotes	7.99 µs	8.10 µs	1.4% slower	±0.9% / ±1.8%
player-engine.lanes.randomizeLR2ConvergeNotes	2.04 µs	2.05 µs	0.4% slower	±1.4% / ±3.1%
player-engine.lanes.randomizeLR2ScatterNotes	5.19 µs	5.11 µs	1.5% faster	±1.5% / ±1.5%
player-engine.lanes.randomizePMSConvergeNotes	15.1 µs	15.2 µs	1.1% slower	±0.9% / ±1.5%
player-engine.lanes.randomizePMSPlayableLanes	20.9 ms	7.17 ms	65.7% faster 🟢	±0.6% / ±0.4%
player-engine.lanes.randomizePMSPlayableNotes	7.71 µs	8.70 µs	12.9% slower 🔴	±1.6% / ±2.7%
player-engine.lanes.randomizeSpiralNotes	1.14 µs	1.15 µs	1.4% slower	±0.4% / ±3.6%
player-engine.lanes.randomizeSRandomNotes	10.1 µs	10.3 µs	2.5% slower	±0.7% / ±13.0%
player-engine.lanes.resolveAutoScratchChannels	81.3 ns	83.3 ns	2.4% slower	±3.3% / ±3.3%
player-engine.lanes.resolveAutoScratchSides	8.57 ns	8.57 ns	0.1% faster	±1.0% / ±3.5%
player-engine.lanes.resolveKeyChannel	43.6 ns	44.2 ns	1.3% slower	±2.9% / ±0.7%
player-engine.lanes.resolveLaneChannels	8.70 µs	8.96 µs	3.0% slower	±0.6% / ±3.4%
player-engine.lanes.resolveLaneDisplayMode	203 ns	215 ns	5.9% slower	±5.1% / ±4.7%
player-engine.lanes.resolveLaneOptionChannels	59.7 ns	59.4 ns	0.6% faster	±0.2% / ±0.3%
player-engine.lanes.resolveLR2LaneIndex	7.17 ns	6.74 ns	6.0% faster	±0.2% / ±1.2%
player-engine.lanes.resolvePlayVariantLaneChannels	9.61 µs	9.74 µs	1.3% slower	±1.1% / ±3.3%
player-engine.lanes.resolveSideKeySlot	6.20 ns	5.96 ns	4.0% faster	±0.8% / ±0.6%
player-engine.lanes.resolveSideRelativeLaneIndex	6.50 ns	6.17 ns	5.1% faster	±0.2% / ±1.1%
player-engine.lanes.resolveWheelLaneDirection	32.4 ns	35.5 ns	9.6% slower ·	±4.3% / ±4.6%
player-engine.PlayerInterruptedError	2.10 µs	2.10 µs	±0.0%	±0.6% / ±0.3%
player-engine.preparePlaybackChart	55.4 µs	51.6 µs	6.8% faster	±2.4% / ±6.5%
player-engine.records.abortedRecordPlayFromResult	20.7 ns	20.7 ns	0.3% faster	±0.2% / ±0.0%
player-engine.records.courseRunKeepsRecord	25.6 ns	25.2 ns	1.7% faster	±2.1% / ±0.3%
player-engine.records.courseRunRecordPlay	6.24 ns	6.00 ns	3.9% faster	±0.2% / ±0.8%
player-engine.records.courseStageKeepsRecord	17.5 ns	17.2 ns	1.8% faster	±6.2% / ±7.1%
player-engine.records.courseStageRecordPlayFromResult	8.75 ns	8.25 ns	5.7% faster	±0.8% / ±0.0%
player-engine.records.isCourseRunAtAnotherTempo	15.3 ns	15.1 ns	1.0% faster	±0.6% / ±0.5%
player-engine.records.isCourseRunAutoPlayed	14.8 ns	14.4 ns	2.2% faster	±0.5% / ±0.5%
player-engine.records.mergeBestRecord	19.9 ns	19.6 ns	1.7% faster	±0.2% / ±0.7%
player-engine.records.mergeCourseStageRecord	22.1 ns	24.5 ns	10.9% slower 🔴	±2.1% / ±5.5%
player-engine.records.playKeepsRecord	6.18 ns	5.94 ns	3.9% faster	±0.1% / ±0.6%
player-engine.records.recordPlayFromResult	8.31 ns	7.92 ns	4.7% faster	±0.0% / ±0.8%
player-engine.records.recordPlayFromSummary	77.8 ns	77.7 ns	0.1% faster	±0.3% / ±0.4%
player-engine.replay.aggregateCourseResult	533 ns	530 ns	0.4% faster	±0.3% / ±0.4%
player-engine.replay.checkCourseReplayEligibility	5.32 µs	5.30 µs	0.3% faster	±1.3% / ±2.3%
player-engine.replay.checkReplayEligibility	9.71 ns	9.23 ns	5.0% faster	±0.7% / ±0.5%
player-engine.replay.computeCourseFingerprint	4.55 µs	4.52 µs	0.6% faster	±3.6% / ±3.9%
player-engine.replay.computeCourseReplayFingerprint	4.99 µs	4.65 µs	6.8% faster	±5.2% / ±4.9%
player-engine.replay.createCourseFingerprintDocument	437 ns	437 ns	±0.0%	±1.4% / ±0.9%
player-engine.replay.createCourseReplay	128 µs	128 µs	0.1% slower	±0.2% / ±0.3%
player-engine.replay.createReplayRecorder	18.1 µs	18.5 µs	2.5% slower	±4.5% / ±0.5%
player-engine.replay.createReplayViewCoalescer	304 ns	304 ns	±0.0%	±1.2% / ±3.1%
player-engine.replay.diffReplayOptions	370 ns	370 ns	0.1% faster	±0.8% / ±0.2%
player-engine.replay.diffReplayView	76.2 ns	76.3 ns	0.1% slower	±1.5% / ±0.3%
player-engine.replay.extractCourseStage	163 µs	163 µs	0.1% slower	±0.0% / ±0.1%
player-engine.replay.listCourseReplayStageCharts	107 ns	106 ns	0.7% faster	±2.5% / ±2.5%
player-engine.replay.matchesCourseReplayStageChart	65.6 ns	65.3 ns	0.5% faster	±1.3% / ±1.1%
player-engine.replay.parseCourseReplay	134 µs	134 µs	0.5% slower	±0.3% / ±0.3%
player-engine.replay.parseReplay	65.1 µs	65.3 µs	0.2% slower	±0.2% / ±0.5%
player-engine.replay.parseReplayOptionChanges	224 ns	221 ns	1.1% faster	±0.5% / ±0.3%
player-engine.replay.parseReplayOptionState	384 ns	385 ns	0.2% slower	±0.5% / ±0.2%
player-engine.replay.parseReplayTempoChanges	43.9 ns	43.7 ns	0.6% faster	±0.8% / ±1.7%
player-engine.replay.parseReplayViewState	56.8 ns	55.9 ns	1.6% faster	±1.4% / ±0.1%
player-engine.replay.playedAtAnotherTempo	8.32 ns	7.97 ns	4.1% faster	±0.2% / ±0.4%
player-engine.replay.ReplayParseError	2.10 µs	2.10 µs	0.4% faster	±4.7% / ±0.6%
player-engine.replay.resolve____GaugeUnit	6.22 ns	6.00 ns	3.6% faster	±0.2% / ±0.4%
player-engine.replay.resolveBeatorajaDefaultTotal	6.30 ns	6.02 ns	4.4% faster	±0.6% / ±1.4%
player-engine.replay.resolveBeatorajaHardRecoverMultiplier	6.29 ns	6.00 ns	4.6% faster	±1.1% / ±0.4%
player-engine.replay.resolveChartRulesetFacts	26.1 µs	26.0 µs	0.5% faster	±1.8% / ±1.3%
player-engine.replay.resolveCourseLamp	53.7 ns	53.9 ns	0.5% slower	±1.1% / ±1.6%
player-engine.replay.resolveCoursePlayedRuleset	270 ns	269 ns	0.3% faster	±0.4% / ±0.0%
player-engine.replay.resolveCourseReplayFilename	163 ns	158 ns	2.9% faster	±1.6% / ±1.1%
player-engine.replay.resolveCourseStageChartFingerprints	18.7 ns	18.7 ns	0.3% faster	±1.0% / ±0.1%
player-engine.replay.resolveCourseTrophy	8.63 ns	8.27 ns	4.2% faster	±0.5% / ±0.9%
player-engine.replay.resolveLR2DefaultTotal	6.25 ns	6.05 ns	3.2% faster	±1.6% / ±1.4%
player-engine.replay.resolveLR2HardDamageMultiplier	6.30 ns	6.15 ns	2.5% faster	±0.8% / ±0.4%
player-engine.replay.resolveNonstopNoteStages	20.6 µs	20.8 µs	0.9% slower	±1.9% / ±3.0%
player-engine.replay.resolveNonstopReplayStages	482 ns	474 ns	1.5% faster	±1.1% / ±1.3%
player-engine.replay.resolvePlayChart	5.08 µs	5.10 µs	0.3% slower	±0.6% / ±0.8%
player-engine.replay.resolveReplayFilename	983 ns	973 ns	1.0% faster	±0.2% / ±1.1%
player-engine.replay.resolveReplayHiSpeed	18.5 ns	18.2 ns	1.7% faster	±0.5% / ±1.0%
player-engine.replay.resolveReplayOptionsAt	43.0 ns	42.8 ns	0.5% faster	±0.2% / ±0.2%
player-engine.replay.resolveReplayTempoAt	9.02 ns	8.54 ns	5.2% faster	±0.0% / ±0.9%
player-engine.replay.resolveReplayViewAt	133 ns	134 ns	0.7% slower	±0.3% / ±0.6%
player-engine.replay.resolveRulesetConfig	8.37 µs	8.29 µs	1.0% faster	±2.2% / ±3.1%
player-engine.replay.resolveRulesetResultLamp	40.7 ns	46.1 ns	13.4% slower ·	±6.2% / ±7.5%
player-engine.replay.resolveRulesetResultMissCount	8.20 ns	7.90 ns	3.6% faster	±0.3% / ±0.5%
player-engine.replay.roundReplayView	40.0 ns	39.9 ns	0.2% faster	±0.1% / ±0.1%
player-engine.replay.serializeCourseReplay	45.3 µs	44.9 µs	0.9% faster	±1.0% / ±0.5%
player-engine.replay.serializeReplay	22.1 µs	22.1 µs	0.3% faster	±0.7% / ±0.2%
player-engine.replay.simulateCourseReplay	276 µs	274 µs	0.7% faster	±1.4% / ±1.0%
player-engine.replay.simulateReplay	49.6 µs	49.1 µs	1.1% faster	±0.8% / ±1.2%
player-engine.replay.simulateReplayRulesets	154 µs	155 µs	0.7% slower	±0.8% / ±7.0%
player-engine.replay.splitNonstopReplay	40.4 µs	40.0 µs	1.1% faster	±0.9% / ±2.5%
player-engine.resolveChartRulesetFacts	22.4 µs	22.1 µs	1.1% faster	±0.6% / ±1.3%
player-engine.resolvePlayChart	4.78 µs	4.79 µs	0.4% slower	±1.3% / ±0.9%
player-engine.ruleset.betterClearLamp	22.4 ns	22.1 ns	1.1% faster	±0.2% / ±0.0%
player-engine.ruleset.clampCustomJudgeRate	6.24 ns	6.02 ns	3.6% faster	±0.6% / ±0.6%
player-engine.ruleset.clearLampAtRank	7.16 ns	6.74 ns	5.8% faster	±1.0% / ±0.3%
player-engine.ruleset.clearLampRank	14.5 ns	14.3 ns	1.4% faster	±0.5% / ±0.3%
player-engine.ruleset.computeScoreRate	7.05 ns	6.62 ns	6.1% faster	±0.3% / ±0.4%
player-engine.ruleset.createEmptyScore	6.18 ns	6.02 ns	2.5% faster	±0.5% / ±0.6%
player-engine.ruleset.isClearLamp	14.0 ns	13.7 ns	2.0% faster	±2.4% / ±0.5%
player-engine.ruleset.isCustomJudgeAssist	116 ns	116 ns	0.1% slower	±0.1% / ±2.2%
player-engine.ruleset.isFullCombo	6.23 ns	5.95 ns	4.4% faster	±0.3% / ±0.6%
player-engine.ruleset.isGaugeType	10.4 ns	9.97 ns	4.0% faster	±0.2% / ±1.6%
player-engine.ruleset.isRulesetId	14.1 ns	14.1 ns	0.1% slower	±0.5% / ±0.3%
player-engine.ruleset.resolve____RankIndexFromScore	7.78 ns	7.55 ns	2.9% faster	±0.1% / ±0.6%
player-engine.ruleset.resolve____RankLabel	10.2 ns	9.93 ns	2.6% faster	±0.4% / ±0.7%
player-engine.ruleset.resolveClearLamp	53.0 ns	53.0 ns	±0.0%	±0.1% / ±0.2%
player-engine.ruleset.resolveCourseClearLamp	27.7 ns	27.5 ns	0.7% faster	±1.1% / ±1.0%
player-engine.ruleset.resolveDisplayedPoor	6.22 ns	5.92 ns	4.8% faster	±0.5% / ±0.3%
player-engine.ruleset.resolveGaugeEndOnFailure	21.1 ns	21.2 ns	0.2% slower	±0.5% / ±0.3%
player-engine.ruleset.resolveGaugeTypes	6.20 ns	5.95 ns	4.0% faster	±0.9% / ±0.5%
player-engine.ruleset.resolveJudgeWindowsMs	25.8 ns	25.6 ns	0.9% faster	±0.2% / ±0.3%
player-engine.ruleset.resolveLR2MoneyScore	6.98 ns	6.57 ns	5.8% faster	±1.8% / ±0.3%
player-engine.ruleset.resolveMissCount	8.81 ns	8.72 ns	1.0% faster	±0.3% / ±2.0%
player-engine.ruleset.topClearLamp	6.15 ns	5.88 ns	4.4% faster	±0.2% / ±0.4%
player-engine.signals.applyHighSpeedControlAction	8.86 ns	8.47 ns	4.4% faster	±0.3% / ±0.3%
player-engine.signals.createPlayerInputSignalBus	102 ns	105 ns	3.2% slower	±4.5% / ±2.8%
player-engine.signals.createPlayerUISignalBus	161 ns	164 ns	2.0% slower	±1.3% / ±4.2%
player-engine.signals.resolveHighSpeedControlActionFromLaneChannels	14.2 ns	13.7 ns	3.6% faster	±0.7% / ±0.8%
player-engine.signals.resolveHighSpeedMultiplier	7.97 ns	7.67 ns	3.8% faster	±0.3% / ±0.5%

Within noise (15): past the threshold, but the runs overlap

API	Base	Head	Change	Run spread (base / head)
player-browser.buildAudioBus	1.97 µs	4.03 µs	104.5% slower	±30.4% / ±5.0%
player-terminal.beginWin32InputModeOptIn	21.2 ns	30.4 ns	43.7% slower	±13.9% / ±27.5%
player-terminal.beginStatefulKeyboardProtocolOptIn	36.1 ns	51.3 ns	41.9% slower	±13.5% / ±31.7%
player-scene-model.joinCourseStageHistories	9.30 µs	12.1 µs	30.2% slower	±15.3% / ±37.5%
player-engine.course.resolveNonstopStageRanks	389 ns	317 ns	18.5% faster	±8.1% / ±17.2%
player-browser.setMasterVolume	503 µs	420 µs	16.5% faster	±28.4% / ±4.6%
player-terminal.beginKittyKeyboardProtocolOptIn	26.6 ns	31.9 ns	20.0% slower	±6.0% / ±11.6%
player-node-audio.audio-sink.createBrowserAudioSink	2.98 µs	3.53 µs	18.5% slower	±18.4% / ±21.2%
player-scene-model.resolveRandomModes	34.7 ns	40.6 ns	17.0% slower	±7.8% / ±20.6%
player-engine.course.resolveNonstopTempo	1.28 µs	1.12 µs	12.3% faster	±4.4% / ±8.6%
player-browser.releaseBeatorajaSceneKitAssets	118 ns	137 ns	16.1% slower	±10.2% / ±9.2%
player-engine.replay.resolveRulesetResultLamp	40.7 ns	46.1 ns	13.4% slower	±6.2% / ±7.5%

…and 3 more.

I/O-bound, not judged (6)

These cases touch the filesystem, so their time follows the OS cache and the disk more than the code.

API	Base	Head	Change	Run spread (base / head)
player-browser.readFilesIntoBytesMap	4.56 µs	4.50 µs	1.3% faster	±2.6% / ±2.7%
player-terminal.createBgaANSIRenderer	2.44 µs	2.47 µs	1.3% slower	±3.1% / ±2.1%
player-terminal.loadStageFileANSIImage	100 ns	100 ns	0.2% faster	±0.5% / ±0.4%
player-terminal.loadStageFileANSILines	164 ns	169 ns	2.8% slower	±7.5% / ±3.0%
player-terminal.loadTerminalANSIImage	1.08 ms	1.09 ms	0.3% slower	±1.2% / ±4.3%
skin-beatoraja.readFilesIntoBytesMap	19.9 µs	18.8 µs	5.9% faster	±3.6% / ±0.9%

Excluded: too fast to time (61)

A timed sample lasted 1 µs or less on at least one side (usually a base commit from before calls were batched), so its time is timer noise and no change is shown.

API	Base	Head
player-browser.applyBeatorajaStretchRect	27.3 ns	28.7 ns
player-browser.ChartPreviewEngine	238 ns	245 ns
player-browser.CourseMaker	98.0 ns	100 ns
player-browser.createSkinFamilyRegistry	195 ns	202 ns
player-browser.destinationToSpriteProps	86.3 ns	86.4 ns
player-browser.GameplayRecorder	79.2 ns	82.4 ns
player-browser.SceneController	251 ns	256 ns
player-browser.setBrowserWorkerCount	38.4 ns	38.4 ns
player-engine.display.resolveAltModifierLabel	6.77 ns	6.24 ns
player-engine.lanes.createBeatorajaLaneRandom	384 ns	368 ns
player-engine.records.courseStageRecordPlayFromSummary	87.2 ns	85.3 ns
player-engine.replay.parseReplayViewChanges	227 ns	227 ns

…and 49 more.

Run details

Measure	Value
Median change (all compared cases)	-0.00%
Mean change	-0.09%
Overall verdict (median vs. threshold)	unchanged
Compared / within noise / I/O-bound / unchanged	699 / 15 / 6 / 669
Benchmarked / skipped (head)	760 / 35
Time / warmup per case	50 ms / 25 ms
Node / platform	v26.12.1 / linux