Mixins Better for Performance

Interesting look at performance difference between mixin and extend in sass. I found this particular point refreshing:

Y’see, when people talk about the performance of mixins, they’re usually thinking about filesize on the filesystem. But because we have gzip enabled (you do have gzip enabled, right?), we should be thinking about filesize over the network.

I often forget this fact. As the Harry Roberts, the author, goes on to show in the article: filesize on the filesystem is one thing and filesize gzipped can often be something else entirely. In his example, File1 was 150% larger than File2 upon compilation, but after gzipping, File1 as 33% smaller than File2.