---
title: "async parallel"
description: "When async operations have no interdependencies, execute them concurrently using `Promise.all()`."
type: skill
canonical_url: https://claudary.paisolsolutions.com/skills/async-parallel
source: "Claudary"
difficulty: intermediate
author: "Claude Code Knowledge Pack"
date: 2026-07-10T11:08:00.169Z
license: CC-BY-4.0
attribution: "async parallel — Claudary (https://claudary.paisolsolutions.com/skills/async-parallel)"
---

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

## Overview

---
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()
])
```

---

Source: [Claudary](https://claudary.paisolsolutions.com/skills/async-parallel) · https://claudary.paisolsolutions.com