You don't know JS: Async & Performance

Name: You don't know JS: Async & Performance
Author: Kyle Simpson

Kyle Simpson

This book focuses on the new asynchronous features in JavaScript, which are new and confusing to developers.

31 score

#46 overall

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Score based on developer article recommendations — not sales data or reviews.

JavaScript Frontendconcurrencyperformance

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🟢 Developer Verdict

A deep dive into JavaScript's asynchronous features and performance optimizations, clarifying common confusions and advanced patterns.

Read this if

✓ You need to untangle complex asynchronous JavaScript patterns.
✓ You want to master Promises, async/await, and event loop mechanics.
✓ You aim to optimize the performance of your JavaScript applications.

Skip this for now if

✗ You are a complete beginner to JavaScript programming.
✗ You prefer practical, project-based coding exercises.
✗ You need a broad overview of general JavaScript language features.

Developer signal: Overwhelming Consensus · 100% 8 analyzed mentions Deep TechnicalFoundational

🔄 Compare & Reading Path

Alternatives

JavaScript: The Good Parts Choose this for a more hands-on, practical approach Intermediate Professional JavaScript for Web Developers An alternative perspective on Javascript Intermediate High Performance JavaScript Choose this for a more hands-on, practical approach Intermediate

📊 Why Developers Recommend

It takes language understanding beyond the basics.

Cited by 12 different developers, each bringing their own experience and perspective.

Developers value this book for building durable technical understanding, going beyond surface-level patterns into the reasoning behind design decisions.

Top signals: Deep TechnicalFoundational

💬 What Developers Say

"Last but not least (in fact that's my favorite), it's a series of 6 books by Kyle Simpson, titled *You don't know JS*."
— kapantzak · Some of my favorite Javascript resources · Aug 7, 2019

"If you've never read Kyle Simpson's fantastic series, [You Don't know JS], I'd first encourage to stop reading this, go read _that_ , and then come back."
— paceaux · Kyle Simpson proved I STILL don't know JavaScript (arrays) · Dec 7, 2019