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In MVC 4 two small but useful features are introduced called, Bundling and Minification which make our website perform faster.
Minification reduced the size of the file by minifying the content (i.e. removing not required blank spaces, removing comments, reducing identifiers). This is done at runtime. Because it also removes stuffs which are browser specific, for example if request is coming from IE it removes all Mozilla specific stuffs.
Steps for Bundling and Minification
1. Open BundleConfig.cs File
2. In RegisterBundles write following code
3. Now in your View, instead of referencing individual files refer the bundle
Peformance Test using IE Developer tools
Also do have a look on below video ASP.NET MVC Model view controller ( MVC) Step by Step Part 1:-