JS Loaders, anyone have any experience with them?

I am trying to incorporate head.js into my current project. It works fine except for the fact that hidden elements flicker when the page loads. I realize this is due to the fact that the scripts are loaded in parallel with one another then executed at the same time.

I was wondering if there was a work around for this that was functional and wouldn't put me at risk for other unforeseen errors down the road.

Are there better loaders out there? From what I read head.js is fairly regarded as one of the better ones with a pretty good reputation but I am all ears for suggestions.

Thanks!