Measuring Largest Contentful Paint in the Field

Lab scores are a guess. Field data is the truth, and collecting it takes fewer lines than you might think.

Reading work aloud is the cheapest editing tool there is. Your ear catches rhythm problems that your eye skips over, especially in long sentences.

We schedule unstructured time on purpose. Some of our best ideas started as an afternoon with no plan and a stack of old magazines.

new PerformanceObserver((list) => {
  const entries = list.getEntries();
  const last = entries[entries.length - 1];
  navigator.sendBeacon('/rum', JSON.stringify({
    metric: 'LCP',
    value: Math.round(last.startTime),
    element: last.element?.tagName,
  }));
}).observe({ type: 'largest-contentful-paint', buffered: true });

Reading work aloud is the cheapest editing tool there is. Your ear catches rhythm problems that your eye skips over, especially in long sentences.