description: Imported skill async_parallel from vercel name: async_parallel signature: 6d2f841896279e976dfcdc1ac89e70771ac188baadfd43c096b5706cb838b961 source: /a0/tmp/skills_research/vercel/skills/react-best-practices/rules/async-parallel.md

title: Promise.all() for Independent Operations impact: CRITICAL impactDescription: 2-10× improvement tags: async, parallelization, promises, waterfalls

Promise.all() for Independent Operations

When async operations have no interdependencies, execute them concurrently using Promise.all().

Incorrect (sequential execution, 3 round trips):

typescript

const user = await fetchUser()
const posts = await fetchPosts()
const comments = await fetchComments()

Correct (parallel execution, 1 round trip):

typescript

const [user, posts, comments] = await Promise.all([
  fetchUser(),
  fetchPosts(),
  fetchComments()
])