Boosting React Performance

Building fast, responsive React apps isn’t magic—it’s the result of understanding how React works under the hood and applying best practices. In this post, we’ll explore: Virtual DOM and selective updates Efficient list rendering and virtualization Memoization techniques with hooks and HOCs Code-splitting and lazy loading Architectural best practices (composition, SOLID, DRY, KISS) Measuring and monitoring performance The Virtual DOM & Selective Updates What is the Virtual DOM? React maintains a lightweight, in-memory representation of the real DOM. This “Virtual DOM” lets React compute exactly what changed without touching the real browser DOM on every render—because direct DOM manipulations are expensive. Diffing Algorithm

May 5, 2025 - 12:11

Building fast, responsive React apps isn’t magic—it’s the result of understanding how React works under the hood and applying best practices. In this post, we’ll explore:

Virtual DOM and selective updates
Efficient list rendering and virtualization
Memoization techniques with hooks and HOCs
Code-splitting and lazy loading
Architectural best practices (composition, SOLID, DRY, KISS)
Measuring and monitoring performance

The Virtual DOM & Selective Updates

What is the Virtual DOM?
React maintains a lightweight, in-memory representation of the real DOM. This “Virtual DOM” lets React compute exactly what changed without touching the real browser DOM on every render—because direct DOM manipulations are expensive.

Diffing Algorithm