![]() ![]() ![]() If your background image is inside an external CSS file, inline it in the HTML. Otherwise, you will be delivering the same large image for a 2880px MacBook and 750px iPhone 6s! Inline background image in HTML Similarly, you can do the same for background images using image-set: You add srcset and sizes to normal images to deliver responsive images based on the device: This will tell the browser to download the image immediately, but display it using a background image. You can add a normal IMG tag with display: none. So in some situations, it’s better to use background-image instead of an IMG tag to leverage other CSS properties. IMG tag with ‘display: none’ hackīackground images can be used in conjunction with background-color, background-repeat, background-attachment, background-position, and background-blend-mode etc. Preloading tells the browser to download that image on high priority. Whether you’re using a background image or IMG tag if the image is in the above fold, preload that image. However, there is a new CSS property object-fit: cover that gives with the same benefit. Previously it was really hard to achieve this with IMG tags. How to Speed Up Background Images? Use IMG tag with object-fitīackground images are commonly used in sliders with some text/content in the centre, or you have a fixed div, and you want to place an image that will ‘fill’ without resizing area ( background-size: cover). Note: If you’re using FlyingPress, we have a helper class “ lazy-bg” to lazy load background images even inside CSS files. However, if the background image is inside an external CSS file or internal, things will get tricky as we can’t figure out whether an HTML element has a background image or not. ![]() Plugins like FlyingPress automatically detect and lazy load them. You can still lazy load background images if they’re in HTML as an inline style. IMG tags can leverage native browser lazy loading, which doesn’t require any JavaScript. If it’s an IMG tag, the image is downloaded instantly when HTML is parsed. This can reflect in your core web vitals metric like Largest Contentful Paint (LCP) if those background images are in the above fold. If the image is inside an external CSS file, it will be downloaded only after downloading and parsing the CSS file, and when the CSS class is actually used in HTML. Why are Background Images Slow? Low priority requests ![]()
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