Consider the following tips and best practices for accelerating web pages using JavaScript and CSS.
JavaScript Optimization
- Compress and Concatenate Code: Compress JavaScript files by removing unnecessary spaces (minify) and reduce file size by combining multiple JavaScript files, thereby minimizing HTTP requests.
- Asynchronous Loading: Load JavaScript asynchronously or at the end of the page (just before the </body> tag) to avoid hindering page loading.
- Lazy Loading: Employ “lazy loading” techniques for JavaScript codes that are not immediately visible or won’t be viewed by the user upon page load.
- Optimize Database Usage: JavaScript can utilize local databases and memory in browsers. Optimize database queries and data access to expedite processes.
- Use ES6 and Later Versions: Employ ECMAScript 6 (ES6) and subsequent versions to write more modern and efficient code.
CSS Optimization
- Compress and Combine CSS: Compress CSS files and reduce HTTP requests by merging multiple files.
- Simplify CSS Selectors: Avoid using complex and unnecessary selectors. Prefer simple and specific selectors.
- Utilize Media Queries: Apply different styles for various devices using media queries in CSS, preventing unnecessary resource loading.
- Optimize Web Fonts: Pay attention to file sizes when selecting web fonts and load only the fonts that are used.
- CSS Animations and Transitions: Use GPU acceleration when employing animations and transitions to prevent freezing and avoid unnecessary animations.
- Use Sprites and Icon Fonts: Combine multiple small images into a single request using a single sprite image or icon fonts.
- Critical CSS: Separate critical CSS for the visible part of the page and load only this CSS initially. Load other CSS files after the page has loaded.
Enhancing page speed significantly improves user experience and positively impacts search engine rankings. Therefore, paying attention to JavaScript and CSS optimizations can enhance your website’s performance. Additionally, you can assess and make improvements to your page speed using online tools such as Google PageSpeed Insights or GTmetrix. To gain in-depth knowledge about JavaScript and CSS and resolve issues related to these on your website, consider collaborating with a proficient SEO agency to elevate your site to higher rankings.
Author: Hakan Karaman
