WebAssembly is an executable format written in binary. It's known to reduce the duration of parsing, and its execution time is much faster compared to JavaScript. However, it also has many limitations.

Recently, I've been hearing from many people wanting to write, or has been writing part of their code in WebAssembly to improve with performance.

Is such a magical feature actually possible? How hard it is to accomplish? How much change will it make? I will report what I have learned from my experience of actually writing WebAssembly.