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.

By Website Optimization on January 16, 2004

CSS: Group Common Styles into Shared Classes

You can group styles common to different rules into their own classes to save repeating yourself. CSS2-compliant browsers can reference multiple classes within individual elements.

By Website Optimization on January 12, 2004

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.

By Website Optimization on December 17, 2003

CSS: Group Selectors and Declarations

By combining the grouping of selectors that share the same declaration and declarations that share the same selector you can apply multiple declarations to multiple selectors. This technique allows you to create compact yet powerful CSS rules. This tip combines Group Selectors with Group Declarations into one powerful technique.

By Website Optimization on December 10, 2003

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.

By Website Optimization on November 26, 2003

CSS: Group Declarations

CSS allows you to group multiple declarations for the same selector into one rule set, separated by semicolons. This allows you to apply multiple declarations to one selector to save space.

By Website Optimization on November 19, 2003

CSS: Group Selectors

CSS allows you to group multiple selectors that share the same declaration. This optimization technique allows you to apply the same style to multiple elements to save space.

By Website Optimization on November 10, 2003

CSS: Use Shorthand Properties

Shorthand properties allow you to specify a set of related CSS properties with a single property. They combine related properties into a shorthand form. In most cases, the browser sets a default value if you leave out an optional one. There are six shorthand properties in CSS:

By Website Optimization on November 4, 2003