Use lazy loading — allow your images to wait with download until user scrolls down to them, it can really shorten page initialization. Hold a position of element — so the page doesn’t jump while the images load. Use the “Blur-up” technique — show a very low-resolution image before the original loads.
Webp is the best format for web.
If high loading speeds are important for you, choose WebP as the image format for your website. JPG and PNG are also good choices for the web. If your choice is between JPG or PNG, use JPG for photos and PNG for logos.
Lazy Loading Techniques for images. Images on a webpage can be loaded in two ways – using the <img> tag, or using the CSS `background` property. Let’s first look at the more common of the two, the <img> tag, and then move on to CSS background images.
Slow site speeds can result from network congestion, bandwidth throttling and restrictions, data discrimination and filtering, or content filtering. If you notice slow speeds when visiting your site, you can run a traceroute between your computer and your website to test the connection.
From the selection of jpeg, png, bmp and tiff jpeg usually is the fastest to load. If you can’t afford lossy compression png seems to be the second fastest, depending on the compression level you choose.
Native Browser Lazy Loading
Native lazy loading is super simple! Add a loading attribute on your img or iframe tag. You can choose the values lazy , eager , and auto . lazy : For using lazy loading.
The loading attribute specifies whether a browser should load an image immediately or to defer loading of off-screen images until for example the user scrolls near them. Tip: Add loading=”lazy” only to images which are positioned below the fold.
Lazy loading is a strategy to identify resources as non-blocking (non-critical) and load these only when needed. It’s a way to shorten the length of the critical rendering path, which translates into reduced page load times.
To determine whether an image has been completely loaded, you can use the HTMLImageElement interface’s complete attribute. It returns true if the image has completely loaded and false otherwise. We can use this with naturalWidth or naturalHeight properties, which would return 0 when the image failed to load.
Among the sites the company looked at, The Financial Times took about 29.5 seconds to load, followed by Bloomberg’s pages, which averaged about 27 seconds. CNN (18.8 seconds), The Wall Street Journal’s homepage (18.6 seconds) and Boston.com (17.9 seconds) rounded out the top five.
So, how fast should a website load? Ideally, you’ll want your website to load within three seconds, or two seconds if it’s an ecommerce site. The two-to-three second mark is the turning point where bounce rates skyrocket – in fact, 40% of consumers will wait no more than three seconds before abandoning a site.
And while the graphics and the images with letters are usually better-looking in the . png file, with the regular photos, JPG is a better choice for the web because if the smaller size. If you decide to use PNGs only, they will slow your website which can lead to frustrated users.
In general, PNG is a higher-quality compression format. JPG images are generally of lower quality, but are faster to load. These factors affect whether you decide to use PNG or JPG, as does what the image contains and how it will be used.
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