![]() This can be incredibly effective at reducing file size, especially with code, since code be incredibly repetitive. Thus will be replaced with a pointer that uses less space than the text itself does. The text within the curly brackets has been discovered by gzip to be repetitive. Julia Evans created a wonderful way to understand this (see her post and video). Gzipping finds all repetitive strings and replaces them with pointers to the first instance of that string. For instance, you’d create a `style.css` that you work with. Minification creates a new file that you ultimately use. The browser can read it and use it just like it could the original file. You wouldn’t want to try to read it or work with it, but it’s not breaking any rules. Minification does things like removing whitespace, removing comments, removing non-required semicolons, reducing hex code lengths… If you didn’t already know that, it’s worth understanding. The network is the speed bottleneck of the web and reducing file size helps.īut these two things are distinctly different. They are both things that reduce the size of the file, making it more efficient in crossing the network between servers and browsers. WordPress (and other CMS) users can also use plugins like WP Rocket to automatically minify JavaScript files.These are both things that you do to assets on your website (things like. The advantage of using a CDN here is that the original and minified JavaScript files are kept in sync i.e., any changes to your original files will be reflected in the minified versions. The actual JavaScript files on your origin server may still be unminified but the CDN will create and serve the minified JavaScript versions of those files to your page visitors. If you're a more advanced user, you can use build tools like UglifyJS and Google's Closure Compiler, among others, to minify your JavaScript files.Īn easy way to serve minified JavaScript files is by using a CDN. If you have a large number of JavaScript files to minify, then consider using more advanced minification tools.Ģ) JavaScript Minification using build tools Repeat this process for all the unminified JavaScript files. Now, copy the minified JavaScript code and paste it into the respective JavaScript file on your website. Identify the JavaScript files flagged by GTmetrix and locate them in your page's HTML.Ĭopy the JavaScript code of the unminified file and paste it into a JavaScript minifying tool like to generate the minified JavaScript file. To fix this audit, follow one of the below JavaScript minification methods:ġ) JavaScript minification using online tools GTmetrix also estimates the JavaScript file size savings possible through minification. GTmetrix reports the file size savings possible through JavaScript minification.
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