curriculum/challenges/english/blocks/lecture-understanding-performance-in-web-applications/67d2f7183a537d7a4908a9ff.md
Have you ever left a website because it took too long to load? Slow page loading can frustrate users and increase bounce rates. Today, we'll explore practical ways to reduce page loading times, ensuring your audience stays engaged.
Number 1: optimize media assets. Large images and videos are common culprits for slow load times. By optimizing these assets, you can significantly speed up your site:
Compress Images: Use tools like TinyPNG to reduce image file sizes without compromising quality.
Use Modern Formats: Implement formats like WebP for images and AV1 for videos to achieve better compression rates.
Lazy Loading: Defer loading off-screen images and videos until they're needed. In HTML, add the loading="lazy" attribute to your media tags.
Next, we have to minimize HTTP requests. Each file your website requests adds to the load time. Reducing the number of HTTP requests can lead to faster page loads. You can:
Combine Files: Merge CSS and JavaScript files to reduce the number of requests.
Use Inline Critical CSS: Place essential CSS directly in the HTML to speed up initial rendering.
Use CSS Sprites: Combine multiple images into a single sprite sheet to minimize requests.
And, of course, you can Leverage Browser Caching. Caching allows browsers to store parts of your website locally, reducing load times for returning visitors:
Set Expiry Headers: Use the Cache-Control header to specify how long browsers should keep files.
Version Assets: When updating files, change their names or use query strings to ensure browsers fetch the latest versions.
You can do this along with minifying and Compressing files, which will reduce the size of your files can lead to quicker downloads:
Minify CSS and JavaScript: Remove unnecessary whitespace and comments using tools like UglifyJS for JavaScript and cssnano for CSS.
Enable Compression: Configure your server to use Gzip to reduce the size of transmitted files.
You can also optimize web fonts. Web fonts can enhance design but may also slow down your site if not handled properly:
Limit Font Variants: Only include the character sets and styles you need.
Use font-display: Control how fonts are displayed during loading by setting the font-display property in your CSS.
So in conclusion, by implementing all these strategies, you can significantly reduce your page loading times, leading to a better user experience and improved site performance.
How can you best optimize web fonts?
Do not use the font color red.
Think about how to limit font variants.
Only include the character sets and styles you need.
Only use titles.
Think about how to limit font variants.
Only use paragraphs.
Think about how to limit font variants.
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How do you set expiry headers?
Use the Cache-Expiration header to specify how long the internet should keep files.
Think about where files are viewed by you.
Use the Cache-Control header to specify how long browsers should keep files.
Use the Cache-Control header to define how long a server should store files before serving new versions.
Think about where files are viewed by you.
Use the Expires header to specify the exact expiration time of the file.
Think about where files are viewed by you.
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How can you ensure browsers fetch the latest versions of assets?
When updating files, change their names or use query strings.
Keep refreshing the browser at least 10 times.
Think about how you can change an asset so the browser thinks it is new.
Use browsers that have cute names.
Think about how you can change an asset so the browser thinks it is new.
Avoiding browser caching.
Think about how you can change an asset so the browser thinks it is new.
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