JavaScript Performance

Learn techniques to write efficient JavaScript, optimize render performance, load assets faster using a CDN and split resource loading with Webpack. You'll learn how to diagnose and fix common performance problems to make your web apps more performant!

• Introduction to Web Performance
• Thinking About Performance
• The Importance of Measurement
• The Cost of JavaScript
• Parsing
• Reducing Parsing Times Exercise
• Reducing Parsing Times Solution
• ASTs and Initial Execution
• The Optimizing Compiler
• Deoptimization, Deleting Properties
• Deleting, Feeding Objects Exercise
• Deleting, Feeding Objects Solution
• Monomorphism, Polymorphism, and Megamorphism
• Optimizing Objects
• Hidden Classes
• Scoping and Prototypes
• Function Inlining
• JavaScript Performance Takeaways
• How Web Pages Are Built
• JavaScript and the Render Pipeline
• Layouts and Reflows
• Layouts and Reflows Exercise
• Layouts and Reflows Solution
• Layout Thrashing
• Solving for Layout Trashing
• FastDOM
• FastDOM Exercise
• FastDOM Solution
• Frameworks and Layout Thrashing
• Painting
• The Compositor Thread
• Managing Layers
• will-change
• Applying will-change with JavaScript
• will-change Exercise
• will-change Solution
• Latency and Bandwidth
• Caching
• Service Workers
• Lazy Loading
• Lazy Loading Demonstrations
• Analyzing Bundle Sizes
• Slimming Dependencies
• Lazy Loading components with React-Loadable
• Component Lazy Loading Exercise
• Component Lazy Loading Solution
• HTTP/2
• Introduction to Using Build Tools
• Paying the Babal Tax
• Useful Babel Plugins
• Prepack
• Final Thoughts
• Q&A