I'm not saying that JavaScript is an efficient choice, especially when likely depending on a gazillion NPM modules... but do you realise that python is actually

I'm not saying that JavaScript is an efficient choice, especially when likely depending on a gazillion NPM modules... but do you realise that python is actually an order of magnitude slower than JavaScript these days? unless the body of your performance sensitive code is within a python library python is very slow. I find the problem with most slow javascript is poorly written code and an unnecessarily deep dependency tree (NPM are not flat dependencies !).