Cheerp creator: Our C++-to-JavaScript compiler beats Emscripten

Cheerp, a C++ compiler that generates JavaScript code for use in any browser, is being upgraded this week with improved performance, reduced output code size, and  backing for 64-bit integers.
Open source Cheerp, from Leaning Technologies, is based on LLVM, which features a set of modular, reusable compiler technologies. Version 1.2, introduced this week, "comes with some big performance improvements, both in execution time and in startup time," according to a blog post by Leaning Technolo