Out of interest, who's using Less/Sass vs plain old CSS

[gebeer]

Just wanted to throw PostCSS into the discussion.

Seems to be the way to go for me. I've been working with SASS for the last 2-3 years now. With PostCSS it is easy to integrate my SASS workflow and further enhance it with PostCSS plugins like autoprefixer, media query packer, minification etc. So you don't really need to change your workflow and get to optimize output of your CSS.

Here are 2 great articles that helped me with the conversion from native SASS compiler to SASS+PostCSS+gulp.

After all I believe that CSS optimization and minification should be done on the client side. Preprocessors can assist here. And even concatenation will soon be a relic of the past when HTTP/2 fully hits the scene.

benbyf has a great blog post with performance comparison http/1.1 vs http/2.