Module 10 of 11

Performance Engineering

Measure, then make it fast everywhere: Node.js internals, database queries, and frontend delivery with caching.

3 lessons

~11 hours

110 XP

Understand the event loop, find the slow code with profiling, hunt memory leaks, and stream instead of buffering.

Indexes, explain plans, and query shape: make MongoDB fast on purpose instead of by accident.

Core Web Vitals, images, fonts, and bundles — then HTTP caching, CDNs, and Redis cache-aside patterns that serve answers before computing them.