Images take a lot of resources to download, and they are often not properly optimized. The two main areas where you can improve by optimizing images are:
Display size vs. actual image size in pixels.
Defer offscreen image loading.
Use a content delivery network (CDN).
Use next generation images.
Optimize image size
A 1MB image will take longer to download than a 100KB image. To combat this, compress the image without losing quality. You can use a tool like TinyPNG to do this, or check out Google's recommended ImageMagick .
Resize image to display size
Another common problem is images that are unnecessarily algeria mobile database much larger than they need to be. Let's say your page displays an image that's 250 x 250 pixels. If the original image was actually 1000 x 1000 pixels, but it was styled to appear smaller using CSS, you could make the load time faster. As it currently stands, the browser needs to download the original (larger) image in order to display it at the smaller size.
Use a Content Delivery Network (CDN)
Make sure you upload images that are the correct size; otherwise, you’ll undoubtedly run into speed issues. WordPress automatically handles this by creating multiple versions of your images upon upload, but if you use another CMS, you may need to resize your images manually.
Using a CDN essentially spreads your server load across many different locations and uses the location closest to your users to serve the assets. The closer the data is, the faster the load time. Sound good? Before you take the plunge, check out the must-know SEO practices for CDNs .