Too many images and HTTP requestsĮvery image file referenced in the web page needs one connection to the server. This also reduces the number of HTTP requests during the initial page load. The images may be placed below the fold and loaded conditionally using JavaScript when the visitor scrolls down to the relevant portion of the page. Instead load them asynchronously after the necessary CSS and HTML has been rendered. Images can take up a significant portion of the render time. When your web page synchronously loads all the HTML, CSS, JavaScript and images together, the initial render time can be very high. Synchronously loading HTML, CSS, JavaScript and Images This can be done in applications like GIMP or Adobe Photoshop for static images or using a cloud image solution for dynamic images. However, these three types of files could be further optimized by reducing the unnecessary overhead that is stored with the images in the form of meta-data.Īpart from that, you can use image manipulation techniques to cut down the size of the image without getting rid of the visual details (for more information, see this wiki page. JPEG, GIF, and PNG are the standard file formats that can compress images to take up a lesser number of bytes, thereby reducing the size of the file to be downloaded. Almost all the screens range from 72 PPI to 100 PPI. 300 DPI is needed for print, not for screens. Standard resolution for image display on web pages is 72 PPI. There’s no point in serving 300 DPI resolution images. Use conditional logic to serve the appropriately sized image file depending on the user device.Ī standard 15” laptop screen has a display capability of about 100 PPI (Pixels Per Inch) or DPI (Dots Per Inch). Instead, generate and store the different sized files. How to fix this:ĭecide on an optimal width and height for image display on different end-user devices like desktop, laptop, tablet, smartphone.ĭo not use one large image and scale the display size with width and height attributes of the IMG element. Large sized images, high-resolution images, and uncompressed images can drastically reduce the page load speed. Too large image files can take a long time to load You should run it with your site to confirm if your images need optimization. Before getting into it, you might be asking yourself: "How do I know that images are currently slowing down my page load time?" Google's PageSpeed Insights is a great tool to validate the speed of your pages and finding troublesome elements.
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