You can improve page load times by delaying the loading of your scripts until some or all of your body content has displayed. For nonessential services (advertising, interface enhancements, surveys, etc.) this technique can boost the initial display speed of your pages. You can also load scripts, such as Ajax, on demand via docu- ment object model (DOM) methods, or by using iframes.
- Use progressive enhancement.
Use progressive enhancement
- Sparse, semantic XHTML for basic content accessible by all browsers
- Enhanced layout provided by external CSS