Tips for Speedy JavaScript from the Google Instant Previews Team

As you probably know, Google recently rolled out its Instant Previews feature. The new feature involves quite a lot of client-side JavaScript, yet doesn’t slow the search engine down for most of us. The Google Code Blog has a post on how the development team managed to add the new feature without noticeably impacting performance.

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Here’s what Google uses to keep the speed up:

• JavaScript compilation with Closure Compiler
• JSONP instead of XmlHttpRequest.
• Data URIs instead of plain images

More details can be found in the original post.

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