Sparkplug adds another compiler and “strikes a balance” between the two in that it generates native machine code, but doesn’t depend on information learned while executing the JavaScript code.

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

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 ...

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.

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

Roslyn features open source C# and Visual Basic compilers offering code analysis APIs. DuoCode is another tool for compiling to JavaScript without actually writing JavaScript.

Apple integrates LLVM compiler to boost WebKit JavaScript performance Since compilers already make fast code, why not take advantage?

Open source community volunteers have shipped an update to the Babel compiler that makes modern JavaScript compatible with older environments, adding speed, easier configurability and much more.