If we want to use it we will try to use less JS. For an example we use only one JS in this busby seo page. It’s only light JS, so it’s doesn’t matter for this page. But, if when we want more JS, I think tips by Niels Leenheer will help us much. He write about Make your pages load faster by combining and compressing javascript and css files.

The key points from his testing are, Combining the set of JavaScript files into one, Compressing that resulting file, Caching the compressed file to disk (instead of compressing on the fly for each request).

To solve this problem, compression, obfuscation and bundling are all great options. Check this url below :

Javascript and CSS Compression

• Bundle-Fu – Bundle Your JS/CSS Assets in 10 Seconds or Less
• Make Your Pages Load Faster by Combining and Compressing Javascript and CSS Files
• Faster Page Loads – Bundle Your CSS and Javascript
• Pack:Tag
  AJAX and CSS Optimization

Javascript Compression

• Serving JavaScript Fast
• JSMin – The JavaScript Minifier
• YUI Compressor
• GZip output compression with AJAX

Don’t forget to check your page SEO score after reducing your script file.