A human can’t tell between a JPEG optimized version and the Original photo. JPEG is a lossy format. To be more exact on this, the correct term is perceptually lossless. You can see below the representation of both reduced files using these two techniques. RAW, BMP, GIF, and PNG are all lossless image formats. Usually, this is done by removing unnecessary metadata from JPEG and PNG files. Lossless image compression refers to compression in which the image is reduced without any quality loss. And the more you compress it, the more degradation occurs. The process is irreversible, once you convert to lossy, you can’t go back. Lossy image compression refers to compression in which some of the data from the original file (JPEG) is lost. lossy compression, which means some loss of fidelity may occur, though in general, it may be imperceptible.īrian Jackson, Director of Inbound Marketing of Kinsta, explained each compression method:.lossless compression, which means the image quality remains largely the same.We used two techniques for image compression for our case study: So why not compress your images to begin with? But if you need to do that, maybe the problem is simply that your images are too big and they slow down your site speed anyway. On WordPress, you can try Advanced Lazy Loador Smush. As with everything else nowadays, there are lots of plugins that can help you. This ensures that your site is functional long before you get to the bandwidth-chugging portions of the page. Let everything else load first and then only at the end start loading images. One solution is to simply delay loading images. Images can play a major role in the difference between “document complete” and “fully rendered site” loading times, especially for mobile sites. Reducing the Image File Size Using the Lossy and Lossless Compression Techniques So, for instance, having a “document complete” time which is faster than the “fully rendered time” could help.Ģ. Even though it is difficult to pinpoint specifically and with certainty which aspect of speed directly helps your rankings, working on your site loading speed, in general, is bound, at the very least, to enhance your users’ experience. The latter means that everything is clearly visible on the page, even background stuff like ads and images. The former means that while not all the elements on a page are showing, you can start clicking and navigating. What is and how exactly does Google measure “site speed?”įor instance, the difference between “document complete” and “fully rendered” time when loading a page was mentioned. Some questions and concerns remain though, the most important being: In fact, chances are smaller sites have the upper hand here in terms of flexibility and adjusting. The slew of freely available tools is certainly meant to wear off some of the concerns that only big sites can benefit from this change. There is the PageSpeed module in the Google Developers section and a Page Speed Insights for making a speed audit for every website.Įven Yahoo has a developer module for page speed improvement, called Yslow. Google thinks the same, as indicated by the very fact that it provides us with tools to check up on our site speed and suggests solutions for sluggish pages. Users get an enhanced experience, site owners are more likely to get reduced operation costs and… well, more users, who stay on the website longer. Site speed, according to Google, “reflects how quickly a website responds to web requests” and for all intents and purposes serves both the user and the site owner.
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