Imageoptim cli full#
Note that the full site still needs the exact same load time we’ve just brought it to your screen sooner. First, you’ll see the original version. We throttled down the connection to “slow 3G” and colored the screen red so you can see the difference. You can view the results in the video below. By relying on a CDN host near you, we have decreased latency and increased delivery speed. Third, to speed up content delivery even further, we deliver our images through the Cloudfront CDN.
Imageoptim cli download#
The result is less download size, and therefore, faster delivery. These images, combined with Scott Jehl’s Picturefill (and responsive image design principles), ensures that we deliver the best and most optimized image for your screen size. Second, we used Andi Smith’s Responsive Images Grunt plugin to create images between 200px to 1600px in size. This ensures that we have the best-compressed images possible, removing unnecessary metadata and converting images into more easily digestible formats where necessary. We made three crucial optimizations for our image assets:įirst, we integrated Jamie Mason’s wonderful ImageOptim-CLI (with its accompanying plugins) into our build process. Images make up more than 60% of the average website (according to the HTTP Archive). Next, we focused on optimization of the images on our site. Believe it or not, the “time to glass” for the initial text contents on our website is roughly 800 milliseconds on a 3G connection! 3. And we want to make sure that our visitors have a fast experience no matter which page they access. We now use some Node.js voodoo to safely perform this procedure for every page we create, since the color schemes change from page to page. We chose a window size that’s as big as our main visitor group’s standard window size (yes, we sometimes do monitor things). This boots up a headless browser rendering of your site and extracts the necessary styles for a given window size. If you have a build process running, maybe with Gulp or Grunt or Slurp or Burp, you can easily use Addy Osmani’s Critical CSS tool for Node.js. All other styles are loaded later without blocking initial content display. With this approach, you have the necessary styles for the initial view ready at the first request. The idea is, instead of blocking page rendering with a request to a CSS file, asynchronously load the CSS files via JavaScript and insert the critical CSS for the above-the-fold content as inline styles directly in the document. This causes a blocking request however and, depending on the size of your CSS file, likely longer delivery and render times. Usually, you place stylesheet links in the head element of a site. With this in mind, we decided to make this part of our website as complete as possible. Speaking of visible content, which part of a website do you usually see first when you access it for the first time? It’s usually the top of the homepage. Traces of this design approach persisted until just a few weeks ago. As the original JavaScript was one of the last page elements to load, it caused a major delay in basic content delivery. With recent changes, however, we’ve been able to deliver visible content much faster, eliminating the first 2-3 seconds of the original 8 seconds “time to glass.” 2. One early iteration featured transitioning background colors upon scrolling, which required some JavaScript to work properly. Our website has undergone numerous iterations since its initial launch, which is understandable considering our agile approach to development. Only afterward did we address the style considerations required for an enhanced web experience. Progressive enhancement (i.e., providing basic web functionality for all browsers while offering enhanced functionality for advanced browsers and connections) is more important than ever if you want to provide fast and reliable web experiences. By embracing progressive enhancement, we retraced our steps and focused first on delivering the content and baseline functionality for all browsers. With no cuts in content size, how did we manage to improve the “time to glass” by more than 80% over a 3G connection? Because we knew from Scott Jehl that More weight doesn’t mean more wait, we focused on three simple principles: 1.
The biggest challenge for our guys was to provide a faster experience while delivering the same amount of content. Assuming you haven’t just switched to a faster Internet service provider, the performance increase is likely due to the tireless efforts of our web experience team. If you’re a frequent visitor, you’ve likely noticed the sped up performance of our website over the past few weeks.
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