Simple JSON to standard HTML table converter in fastest way

The presentation could use some work. The background on the demo site hurts my eyes. The demo site doesn't provide a demo. How is this better, if it is better, than any templating library? (Handlebars, mustache, etc)

I believe it would be simpler and faster to use the table DOM methods, like this: https://gist.github.com/bteitelb/4726756

I'm pretty sure that concatenating strings is not the "fastest way" to create HTML tables.