Renders the same deterministic track several ways, as fast as this device can, in an OfflineAudioContext — the same audio graph a live session runs, minus the realtime deadline. ×realtime is headroom: 1× means this device can barely keep up; live playback wants ≥ 3× to survive GC, UI work and thermal throttling without crackle. Takes ~1–2 min on a phone; keep the screen on.
| case | render | ×realtime | verdict |
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