flowchart TD
  P["Present(N)"] --> E["encode + commit<br/>present command buffer"]
  E --> D["drawable: present after<br/>(N - 0.5) / refresh"]
  D --> S["display<br/>(only when visible)"]
  E --> G["GPU signals gpu_done = frame"]
  G --> L["pacer listener:<br/>at = max(now, last + N / refresh)"]
  L --> T["timer fires at 'at':<br/>done = frame"]
  T --> W["latency object released"]
  T --> A["allocator free:<br/>next Present may encode"]