Function perfRecord

packages/node/src/backend/nodeBackendInline.ts:285–291

(phase: string, durationMs: number)

  let nextFrameSeq = 1;

  function perfRecord(phase: string, durationMs: number): void {
    if (!PERF_ENABLED) return;
    if (perfSamples.length >= PERF_MAX_SAMPLES) {
      perfSamples.shift();
    }
    perfSamples.push({ phase, durationMs });
  }

  function perfSnapshot(): NodeBackendPerfSnapshot {
    const byPhase = new Map<string, number[]>();