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I was fine tuning a page that is heavy on jquery and stumbled across this website:
http://www.componenthouse.com/extra/jquery-analysis.html
When I click on the “Run Test” button the first time, the numbers are way higher than subsequent clicks. Is this because JS is cached by the browser? Can someone explain how this works internally? Can a user choose to not cache the JS?
External javascript files are cached and, of course, an html containing script tags can be cached too.
What you see may be a result of html caching or some browser optimization. You should try different browsers, closing and re-opening your browser and clearing the cache of the browser.