Concatenating resources isn’t some obscure thing only the most elite websites need to worry about. It’s an every website problem. People have tackled this problem in a million ways. CSS sprites were all about concatenating image resources. Icon fonts and SVG sprites are solving that same problem. CSS preprocessors help you concatenate your stylesheets. The Rails Asset Pipeline helps you concatenate resources. There are Grunt and Gulp plugins galore that are designed for this.
But we’re in WordPress land here, so we solutions for that.
Really solid solutions listed here. I use the ever popular W3 Total Cache for some of this, though I could probably always improve the concatenating and minifying of resources that it does.
