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1) Minify your JS: http://www.crockford.com/javascript/jsmin.html

2) Combine it into one file: http://www.thinkvitamin.com/features/webapps/serving-javascr...

3) Gzip before delivering to clients

or...

use just Google JS API: http://ajaxian.com/archives/announcing-ajax-libraries-api-sp...

... and don't use one of the packing (NB: packing, not minifying) approaches unless you measure and understand the performance impact on clients first. Large packed JS can take hundreds of ms to unpack on slow clients.

A good option is to put the files at the end of the page. The page won't load faster but the rendering will be done earlier. The user will see a faster page.

Try to follow Yahoo! performance rules : http://developer.yahoo.com/performance/rules.html

Do lazy loading. Although it doesn't speed up loading really, it helps to create a smooth user experience.

scriptacululous by default loads like 5 separate files. Only load the ones you need!!

Optimize Javascript Pages