Sveltejs Academy · Lesson

Streaming Data with Promises in load

Return unresolved promises from load to stream data after the initial HTML.

Why Stream

Streaming load lets the page render before slow data resolves, improving perceived performance.

Return data with some properties as unresolved promises.

export async function load() {
  return {
    fast: getFastData(),
    slow: getSlowData()   // promise, not awaited
  };
}