Web Site Optimization: Maximum Website Performance

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JavaScript: Defer Execution – with the defer attribute of the script element

First introduced by Internet Explorer 4, the defer attribute of the script element is now part of the HTML 4 and XHTML specifications. The defer attribute gives a hint to the browser that the script does not create any content so the browser can optionally defer interpreting the script. This can improve performance by delaying execution of scripts until after the body content is parsed and rendered.

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Minimize HTTP Requests

By combining external files and optionally including CSS and JavaScript directly within your XHTML pages, you can minimize the number of HTTP requests required to render your page. Each unique HTTP request requires a round trip to a server, introducing indeterminate delays. Users attune to fast, consistent response times. The more HTTP requests that your pages require, the slower and less consistent their response time will be.

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JavaScript: Delay Loading

You can make your content display faster if you delay or defer the loading of your external JavaScript files. JavaScripts are executed as they are loaded. Any external JavaScripts referenced within the head of your XHTML documents must be executed before any body content is displayed. One way around this is to delay the loading of your external JavaScript by using empty “stub” functions, and redefining these functions later on.

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