DOM manipulation means changing elements on a web page using JavaScript.
While this makes websites interactive, it can also slow down your application if done incorrectly.
Efficient DOM manipulation focuses on reducing unnecessary updates and making changes in the smartest possible way.
Why DOM Performance Matters
- DOM operations are slower than normal JavaScript
- Too many updates cause page lag
- Bad DOM handling reduces user experience
- Optimized DOM makes apps smooth and fast
- Professional apps always minimize DOM work
Smart DOM handling is a key performance skill.
Here, the DOM is updated five times.
Each update forces the browser to re-render the page, which hurts performance.
Now the DOM is updated only once.
This reduces reflows and makes the page much faster.
These examples show how smart DOM manipulation improves performance.
By reducing DOM access and batching updates, students gain the ability to build fast, smooth, and professional JavaScript applications that perform well even with large content.