JSFiddle - React, Tailwind, and code Playground

JavaScript

function doit(l) {
    fa = new Float32Array(l);        
    t = window.performance.webkitNow();
    for(i=0,ll=fa.length;i<ll;i++){
        fa[i] = 0;
    }
    console.log("for", l*4/1024/1024, "MB", l, "items it took", window.performance.webkitNow() - t,"ms")    
}
for(l=0;l<9;l++){
    doit(Math.pow(10,l))
}