For this reason these images carry a lot more data and in return are a much large file size. Images saved in lossless format retain all the information needed to produce the original image. Lossy compression is good for web, because images use small amount of memory, but can be sufficiently like the original image. Keep in mind that this is only visible at a very close look. Images saved in a lossy format will look slightly different than the original image when uncompressed.
There are two forms of compression that we need to understand, Lossy and Lossless. Optimizing images for the web can reduce your total page load size by up to 80%. In simple terms optimizing your image works by removing all the unnecessary data that is saved within the image to reduce the file size of the image based on where it is being used in your website. In terms of cost versus benefit optimizing your images should be near the top of your page speed optimizations if you don't have them optimized already. This data can add unnecessary size to the image which leads to longer load times as the user waits for the image to download. Images hold data other than just the pixels we see on the screen. Optimizing your images for the web means saving or compiling your images in a web friendly format depending on what the image contains. With file sizes upwards of a couple of megabytes per image, if you put these files on your website it would be very slow to load. This is because the images are made in a format which makes them easier to manipulate in different ways. The images you create in programs like Photoshop and Illustrator look amazing but often the file sizes are very large. Use efficient CSS selectors (deprecated)Īnalyze What is optimizing images for the web?.Specify a viewport for mobile browsers (deprecated).Specify a Vary: Accept-Encoding header (deprecated).Serve static content from a cookieless domain (deprecated).Remove query strings from static resources (deprecated).Parallelize downloads across hostnames (deprecated).Optimize the order of styles and scripts (deprecated).Make landing page redirects cacheable (deprecated).Improve server response time (deprecated).Defer loading of JavaScript (deprecated).Combine external JavaScript (deprecated).Avoid Flash on mobile webpages (deprecated).Avoid CSS Avoid CSS expressions (deprecated).Use passive listeners to improve scrolling performance.Use explicit width and height on image elements.Serve static assets with an efficient cache policy.Replace large JavaScript libraries with smaller alternatives (deprecated).Remove duplicate modules in JavaScript bundles.
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