Performance best practices are habits that professional developers follow to keep their applications fast and reliable.
Instead of fixing performance issues later, it is better to write optimized code from the beginning.
By following these best practices, students can build JavaScript applications that run smoothly even as they grow in size and complexity.
Key Performance Best Practices
- Avoid unnecessary loops and calculations
- Minimize DOM access and updates
- Remove unused variables and listeners
- Use efficient data structures
- Break large tasks into smaller ones
- Avoid blocking the main thread
- Test performance regularly
These habits help prevent slow and buggy applications.
This function blocks the main thread, freezing the UI.
Users experience lag and poor responsiveness.
By splitting the task, the browser can handle user interactions in between.
This keeps the app responsive.
These examples show how following performance best practices leads to smoother and faster applications.
By developing these habits, students gain the mindset of professional developers who care about efficiency, quality, and user experience — an essential step toward job-ready JavaScript skills.