However, JavaScript compilers can optimize your JavaScript code and generate improved code. The compiled JavaScript files are smaller than your original JavaScript files, reducing download times ...

Sparkplug is a new JavaScript compiler that fills the gap between needing to start executing quickly and optimizing the code for maximum performance.

Emscripten C/C++-to-JavaScript project uses a back-end derived from LLVM for greater speed and a more dedicated compiler.

Higgs, an experimental JavaScript engine written in D, uses novel approaches to speed up JavaScript -- and could inspire similar projects An experimental new JavaScript compiler could provide ...

Google says its new JavaScript compiler saves 17 years of Chrome users' CPU time each day. It should also benefit all Chromium browsers that use it.