Web Performance Fundamentals

Throughout the book, you’ll follow a clear, hands-on path that mirrors the real performance journey of a modern web app. We'll start by understanding why speed matters (and how to measure it), then explore initial-load performance and why it's so critical for a first impression. In the process, we’ll turn performance Flame Graphs from an incomprehensible mess into relaxed bedtime reading, gain a deep understanding of every render pattern (CSR, SSR, RSC, etc.), and learn how to measure the impact of each one.