Removing unused CSS and JS can indeed help speed up your website. When a web page loads, the browser needs to download and process all the CSS and JavaScript files associated with it. If these files contain unnecessary code that is not used on the page, it can slow down the loading time.

There are a few approaches you can take to remove unused CSS and JS from your website:

1. Manual code review: Analyze your CSS and JS files to identify code that is not being used. This can be a time-consuming process, especially for larger websites with complex codebases. You’ll need to carefully examine your HTML templates and JavaScript code to determine which CSS and JS files are truly necessary.
2. Automated tools: There are several tools available that can help identify and remove unused CSS and JS code. These tools analyze your website’s code and generate a report of unused code snippets. Examples of popular tools include PurifyCSS, UnusedCSS, and UnusedJS. These tools can save you time compared to manual code review, but it’s important to review the results to ensure that the tool accurately identifies unused code.
3. CSS and JS minification: Minification is the process of removing unnecessary characters from code files, such as whitespaces, comments, and line breaks, to reduce file size. This can indirectly remove unused code by eliminating unnecessary characters. Minification can be done manually or using automated tools like UglifyJS for JavaScript and CSSNano for CSS.

It’s worth noting that removing unused CSS and JS should be done carefully to avoid unintentionally breaking your website’s functionality. It’s recommended to have a backup of your original code and thoroughly test your website after making any changes.

Additionally, optimizing other aspects of your website, such as image sizes, caching, and server response times, can also contribute to improving overall web page speed. Consider using tools like Google PageSpeed Insights or GTmetrix to get insights into other areas for improvement on your website.