A lot of web page optimizations can be time-consuming and may require more technical knowledge than you are accustomed to. However, properly sizing images should be one of the easiest optimizations you can carry out. Often, images are uploaded to your site without being properly sized. While it is great to have high-resolution images, there are methods that we discussed earlier, like compressing, that help to reduce image file sizes without sacrificing quality.
Another method is simply resizing images. Images that are not properly resized before being loaded to your server can lead to slower page load times, either because they are just too big or because the browser must resize them as the page is rendered, which creates additional processing time and delays. Again, it is important to remember that most web traffic is now coming from mobile devices, so imagine having to download large images over a spotty network. Not a great user experience.