As far as testing tools, we have released a distributed testing framework that allows you to write tests (with Mocha, or similar) that run across many machines

As far as testing tools, we have released a distributed testing framework that allows you to write tests (with Mocha, or similar) that run across many machines and it verifies wither your system is correct: https://github.com/gundb/panic-server https://github.com/gundb/panic-server In terms of performance I recommend things like Benchmark.js, and I recently did a talk on JS performance here: https://www.youtube.com/watch?v=BEqH-oZ4UXI https://www.youtube.com/watch?v=BEqH-oZ4UXI . Your question is great! Definitely not trivial. :)