How can you effectively enhance images for optimal web performance? (Transitioning from Figma wireframe to code)

As I work on building my portfolio from scratch, one challenge I am facing is how to include high-quality images without sacrificing site speed or image resolution.

I used Figma to create wireframes, but when I exported the images, I noticed a significant reduction in quality. While exporting them at 2x or 3x improves resolution, it comes at the cost of speed. Since I am new to front-end development and coding my website as a learning process, I could use some guidance. My specific questions are:

  1. What are some best practices for optimizing images for web use?
  2. How can you determine if an image is too large? What is the ideal size for optimized images?
  3. Do you have any tips, tricks, or resources that I should explore further? Thanks a lot 🤓
htmlcss

Answer â„–1

If you want your website to load faster and run more smoothly, there are a few tactics you can employ to optimize high-quality images:

Lazy Loading for Efficiency

By implementing lazy loading with JavaScript, images will only load when they enter the user's view, reducing unnecessary resource consumption and improving page load times.

Read more about lazy loading here.

Progressive Loading Strategy

Take a cue from Medium's approach by initially displaying a low-quality image that progressively upgrades to higher resolutions. This method gives users a visual clue that content is on its way, enhancing their experience.

Learn more about progressive loading here.

Optimize File Formats

Utilize modern file formats like WebP to reduce image size without compromising quality. Be sure to consider browser compatibility and provide fallback formats such as JPEG or PNG for unsupported browsers.

Discover more about optimizing file formats here.

Explore these free online tools to compress and optimize your images:

  • TinyPNG
  • CleverCompress
  • Squoosh

Additional Optimization Tips

  • Compression: Always compress web images and use 72 DPI instead of 300 DPI for print. Ensure images are in RGB color format.
  • File Formats: Opt for PNG for transparent backgrounds or icons, JPEG for detailed photos, and SVG for scalable vector graphics.
  • Image Sizing: Avoid uploading oversized images; match image dimensions to their intended display area for best results.

By following these strategies, you can enhance your website's performance without sacrificing image quality.

Answer â„–3

Currently, Google's recommendation for photo size is around 200kb, which I know is not sufficient. As a photography enthusiast, I have a website with 80 images per page that are indexed and load quickly. The site scores 100/100 on Google PageSpeed Insights and is well-indexed by search engines. I also use multiple versions of images based on screen width.

To ensure fast loading speeds, I utilize IntersectionObserver to only load visible images on the screen.

Below is an example showing how one image adapts to different screen widths:

<picture>
  <source data-srcset="./images/lwow/576/IMG_0114.jpg" media="(max-width: 576px)"> 
  <source data-srcset="./images/lwow/768/IMG_0114.jpg" media="(max-width: 768px)"> 
  <source data-srcset="./images/lwow/992/IMG_0114.jpg" media="(max-width: 992px)"> 
  <source data-srcset="./images/lwow/1200/IMG_0114.jpg" media="(max-width: 1200px)"> 
  <img data-src="./images/lwow/1200/IMG_0114.jpg">
  <noscript><img src="./images/lwow/1200/IMG_0114.jpg"></noscript>
</picture>

For the complete code, visit this GitHub link.

PS. To optimize photos exported from Photoshop, I recommend using TinyJPG. For bulk optimization, check out my tool "sharp-images" on my GitHub repository.

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