Fast websites depend not only on good design but also on efficient CSS.
Heavy and unoptimized CSS can slow down page loading and animations.
In this lesson, you will learn how to write CSS that performs well on all devices.
Animating width and height forces the browser to recalculate layouts.
Animating transform is much faster and smoother.
Complex selectors slow down style matching.
Simple class selectors are faster and easier to manage.
Reducing repeated code makes CSS smaller and faster to load.
It also improves maintainability.
Performance tips for CSS
- Use class selectors instead of deep nesting
- Animate transform and opacity
- Remove unused CSS
- Avoid duplicate rules
- Keep files small and organized
Unused CSS increases file size and slows down websites.
Always remove styles that are no longer used.
Practice task
Optimize a CSS file by:
- Removing unused rules
- Replacing deep selectors with class names
- Using transform for animations
- Reducing duplicate code
Next lesson
In the next page, you will learn how to create reusable components and utility classes.