Does headjs offer any practical performance benefits over traditional JavaScript approaches? [closed]

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From the information on the headjs website, it looks like loading files in parallel using headjs is the fastest way to load external JS files. It also says that loading JS files on the bottom or top of the page doesn’t make a big difference.

It sounds convincing, but I'm afraid that the website is biased.

Which is faster?

• Using headjs
• Packagine / gzipping / minifying / compiler your javascript