jika kita menggunakan SSR biasanya ketika pindah ke halaman lain yang melakukan fetching API itu lama,karena kita menunggu semua halaman selesai melakukan fetching.
jika dengan streaming kita bisa masuk ke halaman yang dituju tanpa menunggu fetching selesai.

untuk jelasnya bisa lihat code dibawah ini.

// @filename: src/routes/+page.server.ts
// @noErrors
import type { PageServerLoad } from './$types'
import { setTimeout } from 'timers/promises'

interface IResponse {
  body: string
  id: number
  title: string
  userId: number
}
async function getData() {
  const res = await fetch('https://dummyjson.com/comments')
  const json = await res.json()
  await setTimeout(100)
  return json.comments
}
async function getMock2() {
  const res = await fetch(`https://dummyjson.com/comments`)
  const postData = await res.json()
  await setTimeout(3000)
  return postData.comments
}

export const load: PageServerLoad = async () => {
  return {
    one: getMock1(),
    streamed: {
      two: getMock2(),
    },
  }
}

<!-- @filename: src/routes/+page.svelte -->
<script lang="ts">
	import type { PageData } from './$types';

	export let data: PageData;
</script>

<div class="flex flex-col gap-4 my-4">
	{#await data.streamed.two}
		{#each Array(10) as _}
			<div class="px-4">
				<div class="shimmer h-10 w-full" />
			</div>
		{/each}
	{:then value}
		{#each value as item}
			<div class="bg-orange p-4">{item.id}. {item.body}</div>
		{/each}
	{:catch error}
		{error.message}
	{/await}
</div>