The new JS minifier has been released with very high performance and high compressions rates. It is the fastest minifier and is written in Go. Compression speed of JS can reach up to 25 MB/s, while existing solutions are orders of magnitude slower and in the range of 100–300 kB/s. There are implemented minifiers for all common web formats (HTML, CSS, JS, JSON, SVG, XML), there is an online demo and a command line tool that can be incorporated into your setup easily. Let me know how you incorporate minification in your workflow!
Tdewolff/minify: a new JS minifier that is very fast and has high compression ratios (also HTML, CSS, SVG, XML, JSON)