The advanced React book. 16 chapters and 105 interactive examples on how React really works, from re-renders and reconciliation to refs and performance. 4.8★ on Amazon, 4,500+ developers.

How to turn a real-world 300k-line codebase into an AI-friendly playground, where AI coders ship features and engineers don't go insane.

What are AI tools and agents really, and how do they keep Context in check? Let's poke around Claude Code, do a few experiments, and find out!

How does AI actually remember things between messages, and why does it forget halfway through? I ran a few experiments on Claude Sonnet and GPT-5 and wrote down what I saw.

Can AI actually debug complex React/Next.js issues? I tested it on three real bugs, investigated the root cause myself and wrote down the results.

Can React Server Actions replace fetch for client-side data fetching? Let's investigate and find out.

A practical guide to analyzing and reducing JavaScript bundle size. Learn bundle analysis, fix tree-shaking issues, remove duplicate libraries, and otherwise optimize your React app's JavaScript size.

A data-driven comparison of CSR, SSR, and RSC under the same app and test setup, focusing on initial-load performance and the impact of client- vs server-side data fetching (including Streaming + Susp...

Learn how to manage state in modern React apps, what is remote, URL, local, and shared state, and when you actually need a state management library.

On 30th and 31st of October, 2025, the sixth edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

Why do we need Context/Redux/Zustand in React, what is the purpose of Local Storage, its limitations, and when to use it.

Investigating performance of Tailwind vs Linaria frameworks, with a focus on initial load and interaction performance.

Explore step-by-step how Server-Side Rendering (SSR), pre-rendering, hydration, and Static Site Generation (SSG) work in React, their costs, performance impact, benefits, and trade-offs.

Intro to Performance Flame Graphs. Learn how to read and extract useful info from performance flame graphs while exploring how the Client-Side rendering works in React applications.

Exploring Core Web Vitals, Chrome performance panel, what initial load performance is, which metrics measure it, and how cache control and different networking conditions influence it.

Advanced React concepts, strategies, techniques, deep dive investigations, that will take your React knowledge to the next level.